Manitowoc National Crane NBT40 Series Service Manual
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Manitowoc National Crane NBT40 Series Service Manual

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  • Page 1 National Crane NBT40 Series Service Manual...
  • Page 3 Untrained operators subject themselves and others to death or serious injury. Do not operate this crane unless: • You are trained in the safe operation of this crane. Manitowoc is not responsible for qualifying personnel. • You read, understand, and follow the safety and operating recommendations contained in the crane manufacturer’s manuals and...
  • Page 4 CALIFORNIA PROPOSITION 65 WARNING Diesel engine exhaust and some of its constituents are known to the State of California to cause cancer, birth defects, and other reproductive harm. WARNING California Proposition 65 Breathing diesel engine exhaust exposes you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

  • Page 5: Table Of Contents

    NBT40 SERVICE MANUAL SECTION 1 ..........Introduction Supplemental Information .
  • Page 6 NBT40 SERVICE MANUAL System Pressure Check ..........2-13 Hoist.
  • Page 7 NBT40 SERVICE MANUAL Cable Retention ........... . 4-4 Four Section Top/bottom Pad Replacement, Assembled Boom.
  • Page 8 NBT40 SERVICE MANUAL Swing Drive ............6-1 Swing Brake.
  • Page 9 NBT40 SERVICE MANUAL Hydraulic Oil ............8-2 Standard Hydraulic Oil .
  • Page 10 NBT40 SERVICE MANUAL Boom Weight ........... . . 9-34 Dimensional Drawing .

  • Page 11: Supplemental Information

    (HCAS), a safe load indicator (SLI), or or this publication, please consult your National Distributor an ECS5; Manitowoc refers to these systems as a rated for the latest information. Your National Distributor is capacity limiter (RCL) throughout its Operator’s and Service equipped with the proper tools, necessary National parts, Manuals.)

  • Page 12: Safety Information

    INTRODUCTION NBT40 SERVICE MANUAL Safety Information Basic Nomenclature A Safety Compact Disc (CD) which includes sections on The nomenclature used to describe parts of a National Crane Operation, Safety and Maintenance for National Crane are described in Figure 1-2. This nomenclature is used operators and owners is supplied when the crane is throughout this manual.
  • Page 13 NBT40 SERVICE MANUAL INTRODUCTION 7474-1 7474-4 7474-5 7474-3 7474-2 FIGURE 1-2 Item Component Item Component Boom Angle Indicator Crane Cab Hoist Cable Crane Cab console Operator’s Seat Turret Boom Stabilizer Front Outrigger (SFO), Front Outrigger Jack Boom Nose Hydraulic Tank Boom Rest Hydraulic Pump (not shown) Lift Cylinder...

  • Page 14: General Maintenance

    INTRODUCTION NBT40 SERVICE MANUAL GENERAL MAINTENANCE All supporting members (chains and cables) need to be parallel to each other and as near perpendicular as possible The suggestions listed below are helpful in analyzing and to the top of the object being lifted. correcting problems: CAUTION •...

  • Page 15: Bearings

    NBT40 SERVICE MANUAL INTRODUCTION Bearings driver or a bar with a smooth flat end. If a sleeve bearing has an oil hole, align it with the oil hole in the mating part. Antifriction Bearings Gaskets When an antifriction bearing is removed, cover it to keep out dirt and abrasives.

  • Page 16: Electrical

    INTRODUCTION NBT40 SERVICE MANUAL Keep The System Clean Remove the batteries If the machine is not used for an extended period of time. Store the batteries in a warm, dry When removing components of a hydraulic system, cover all place, preferably on wooden shelves. Never store on openings on both the component and the crane.

  • Page 17: Fatigue Of Welded Structures

    Torque values should correspond to the type bolts, studs, inspection of all weldments is good practice. and nuts being used. Loctite The torque tables are provided by Manitowoc for reference when performing maintenance. DANGER Use of proper torque values is extremely important. Improper torquing can seriously affect performance and reliability.
  • Page 18 INTRODUCTION NBT40 SERVICE MANUAL Torque Wrenches • Torque wrenches must be those specified and forces must be applied at the handle grip. The use of handle Flexible beam type wrenches, even though they might have extensions will change applied torque to the bolt. a pre-set feature, must be pulled at right angle and the force •...
  • Page 19 NBT40 SERVICE MANUAL INTRODUCTION Table 1-1 Inch Series with Coarse Threads (UNC) – Zinc Flake Coated Nominal Size, Threads per Torque (ft/lb) Inch, and Series Grade Maximum Nominal Minimum Designation 1/4-20 UNC 13.5 13.2 12.8 5/16-18 UNC 19.1 18.6 18.1 24.0 23.4 22.8...
  • Page 20 INTRODUCTION NBT40 SERVICE MANUAL Table 1-2 Inch Series with Fine Threads (UNF) – Zinc Flake Coated Nominal Size, Threads per Torque (ft/lb) Inch, and Series Grade Maximum Nominal Minimum Designation 1/4-28 UNF 10.6 10.4 10.1 15.0 14.6 14.2 5/16-24 UNF 21.1 20.6 20.1...
  • Page 21 NBT40 SERVICE MANUAL INTRODUCTION Nominal Size, Threads per Torque (Nm) Property Inch, and Series Class Maximum Nominal Minimum Designation M6x1.0 10.9 12.2 11.9 11.6 12.9 14.3 13.9 13.6 20.2 19.7 19.2 M8x1.25 10.9 29.6 28.9 28.2 12.9 34.7 33.8 33.0 40.0 39.0 38.0...
  • Page 22 INTRODUCTION NBT40 SERVICE MANUAL Nominal Size, Threads per Torque (Nm) Property Inch, and Series Class Maximum Nominal Minimum Designation 2089.8 2037.6 1985.3 M36x4 10.9 2976.4 2902.0 2827.6 12.9 3483.0 3395.9 3308.9 Table 1-4 Metric Series with Fine Threads – Zinc Flake Coated Nominal Size, Threads per Torque (Nm) Property...
  • Page 23 NBT40 SERVICE MANUAL INTRODUCTION Nominal Size, Threads per Torque (Nm) Property Inch, and Series Class Maximum Nominal Minimum Designation 386.0 376.3 366.7 M20x1.5 10.9 549.7 535.9 522.2 12.9 643.3 627.2 611.1 520.8 507.8 494.8 M22x1.5 10.9 741.7 723.2 704.7 12.9 868.0 846.3 824.6...
  • Page 24 INTRODUCTION NBT40 SERVICE MANUAL Table 1-5 Metric Series Screws of STAINLESS STEEL A2-70/A4-70 with Coarse Threads Size Torque (Nm) M2.5x0.45 M3x0.5 M4x0.7 M5x0.8 M6x1 M8x1.25 M10x1.5 Torque Values for fasteners with lubrication these torque values result in an 80% utilization of the yield strength. Stainless steel fasteners tend to gall while being tightened.
  • Page 25 NBT40 SERVICE MANUAL INTRODUCTION Table 1-7 Inch Series Bearing Bolts – Untreated (black finish) Nominal Size, Threads per Torque (ft/lb) Inch, and Series Grade Maximum Nominal Minimum Designation 5/8-11 UNC 5/8-18 UNF 3/4-10 UNC 7/8-9 UNC 1-8 UNC 1 1/4-7 UNC 2043 1964 1885...
  • Page 26 INTRODUCTION NBT40 SERVICE MANUAL Inch Series with Coarse Threads (UNC) – Untreated (black finish) Table 1-9 Torque (ft/lb) Size Grade Maximum Nominal Minimum 1/4-20 12.5 11.5 5/16-18 3/8-16 7/16-14 1/2-13 9/16-12 5/8-11 259.5 3/4-10 7/8-9 1 1/8-7 1342 1288 1234 1141 1097 1053...
  • Page 27 NBT40 SERVICE MANUAL INTRODUCTION Inch Series with Fine Threads (UNF) – Untreated (black finish) Table 1-10 Torque (ft/lb) Size Grade Maximum Nominal Minimum 1/4-28 14.5 13.5 5/16-24 3/8-24 7/16-20 84.5 1/2-20 9/16-18 174.5 5/8-18 299.5 3/4-16 439.5 7/8-14 1-12 1009 644.5 1-14 UNS 908.5...
  • Page 28 INTRODUCTION NBT40 SERVICE MANUAL Metric Series with Coarse Threads – Untreated (black finish) Table 1-11 Torque (Nm) Property Size Class Maximum Nominal Minimum M4x0.7 10.9 12.9 M5x0.8 10.9 12.9 10.5 10.5 M6x1 10.9 12.9 M8x1.25 10.9 36.5 12.9 43.5 M10x1.5 10.9 12.9 M12x1.75...
  • Page 29 NBT40 SERVICE MANUAL INTRODUCTION Torque (Nm) Property Size Class Maximum Nominal Minimum 1134 1090 1046 M27x3 10.9 1591 1530 1469 12.9 1910 1836.5 1763 1538 1479 1420 M30x3.5 10.9 2163 2080 1997 12.9 2595 2495 2395 2681 2578.5 2476 M36x4 10.9 3964 3812...
  • Page 30 INTRODUCTION NBT40 SERVICE MANUAL Metric Series with Fine Threads – Untreated (black finish) Table 1-12 Torque (Nm) Property Size Class Maximum Nominal Minimum M8x1 10.9 39.5 12.9 M10x0.75 10.9 12.9 M10x1.25 10.9 12.9 97.5 M12x1 10.9 12.9 M12X1.25 10.9 141.5 12.9 165.5 M12x1.5*...

  • Page 31: Weld Studs

    NBT40 SERVICE MANUAL INTRODUCTION Torque (Nm) Property Size Class Maximum Nominal Minimum 803.5 M24x2 10.9 1176 1130.5 1085 12.9 1410 1356 1302 1225 1171.5 1130 M27x2 10.9 1718 1652.5 1587 12.9 2063 1983.5 1904 1530 1471.5 1413 M30x1.5 10.9 2253 2166.5 2080 12.9...

  • Page 32: Hoist Cable Inspection And Maintenance

    The following information includes inspection, replacement, Crane may be equipped with synthetic hoist rope or wire and maintenance guidelines for wire rope as established by rope. Hoist rope may be purchased through Manitowoc ANSI/ASME B30.5, federal regulations, and National Crane Care.

  • Page 33: Recommendations For Servicing Wire Rope

    The inspection intervals may also be only pre-assembled lengths of wire rope as supplied predetermined by state and local regulatory agencies. from Manitowoc CraneCARE. Do not build lengths from NOTE: Wire rope...

  • Page 34: Boom Extension And Retraction Cables

    Consensus Standard as referenced by Federal Government sheaves, auxiliary boom nose sheaves, and hoist drums Agencies and Manitowoc CraneCARE recommendations to for wear. Damaged sheaves or hoist drums can help determine when wire rope needs to be replaced. Wire...

  • Page 35: Seizing Wire Rope

    NBT40 SERVICE MANUAL INTRODUCTION 1/32 inch for diameters 3/8 and 1/2 inch inclusive. of the seizing. Tighten the seizing by alternately prying and twisting. Cut off both ends of the wire and pound the twist flat 3/64 inch for diameters 9/16 to 3/4 inch inclusive. against the rope (Figure 1-8).
  • Page 36 INTRODUCTION NBT40 SERVICE MANUAL THIS PAGE BLANK 1-26 Published 8-01-2017 Control # 287-11...

  • Page 37: Section 2

    NBT40 SERVICE MANUAL HYDRAULIC SYSTEM SECTION 2 HYDRAULIC SYSTEM SECTION CONTENTS Maintenance ....... . . 2-4 Boom Lift .
  • Page 38 HYDRAULIC SYSTEM NBT40 SERVICE MANUAL Description Symbol Description Symbol Hydraulic Reservoir - Stores, cools, and Filter - Removes contamination from cleans machines hydraulic fluid supply. hydraulic fluid. Hydraulic Return Lines - Terminated at (1) Filter with Bypass Valve - Bypass valve below fluid level (2) above fluid level.
  • Page 39 NBT40 SERVICE MANUAL HYDRAULIC SYSTEM Description Symbol Description Symbol Single Acting Cylinder - Extended Manually Operated - Valve shifted hydraulically and retracted with a spring. manually with check to allow flow back to tank. Double Acting Cylinder - Extended and retracted hydraulically.

  • Page 40: Maintenance

    HYDRAULIC SYSTEM NBT40 SERVICE MANUAL MAINTENANCE the machine or another hose and has a minimum of bending and twisting. Tighten bolts in both couplings. General Due to manufacturing methods, there is a natural curvature to a hydraulic hose. The hose should be installed so any Before adjustments and repairs are started on a crane, the bend is with this curvature.

  • Page 41: Removing Air From The Hydraulic System

    NBT40 SERVICE MANUAL HYDRAULIC SYSTEM Remove the reservoir drain plug. Allow about three 15. Disconnect the return line from the hoist motor and fully minutes after hydraulic oil stops flowing from the drain hoist up. port for the side walls to drain. 16.

  • Page 42: System Description

    HYDRAULIC SYSTEM NBT40 SERVICE MANUAL • Hydraulic Tank with Filter • Hydraulic Remote Controllers (HRC) DANGER Locate the machine on a firm supporting surface and Axial Piston Pump position the boom over the front on outriggers when The axial piston pump is pressure compensated and extending the boom at low angles.

  • Page 43: Hydraulic Tank

    NBT40 SERVICE MANUAL HYDRAULIC SYSTEM which is determined by a pressure relief valve located on the Hydraulic Remote Controllers hydraulic pump. The crane functions are controlled by hydraulic remote Front Outrigger Manifold controllers (HRC) on the armrest of the operators seat. The controllers operate from a load sense pilot pressure which is The front outrigger manifold is located in the center of the applied to the bonnets on each side of the valve spools to...
  • Page 44 HYDRAULIC SYSTEM NBT40 SERVICE MANUAL Hydraulic Valve Locations Item Component Item Component Main Control Valve (lift, telescope, hoist) Rear Outrigger Solenoid Manifold Main Control Valve (Optional Aux Hoist) Front Outrigger Solenoid Manifold Swing Control Valve FIGURE 2-1 Outrigger Pressure Reducing Valve Pilot Valve (Air Conditioner/Swing Brake) Swing Speed Control Valve Dump Valve...
  • Page 45 NBT40 SERVICE MANUAL HYDRAULIC SYSTEM Main Control Valve - 4 Section Valve (with Aux. Hoist) 7591 FIGURE 2-2 Main Control Valve (with Aux Hoist) Item Numbers Item Description Item Description Item Description Aux Hoist Relief Valve - Up Aux Hoist Relief Valve - up Gauge Port Tele Cyl Relief Valve - extend Lift Cyl Relief Valve - up...
  • Page 46 HYDRAULIC SYSTEM NBT40 SERVICE MANUAL Main Control Valve - 3 Section Valve (without Aux. Hoist) 7590 FIGURE 2-3 Main Control Valve Item Numbers - 3 Section Item Description Item Description Item Description Lift Cyl Relief Valve - extend Lift Cyl Relief Valve - Load Sense Bleed-Off Main Hoist Relief Valve - raise Main Relief Valve...
  • Page 47 NBT40 SERVICE MANUAL HYDRAULIC SYSTEM Swing Control Valve 75881-1 75881-2 FIGURE 2-4 Swing Control Valve Item List & Port/Hosing Item/Port Description Item/Port Description Item/Port Description Swing Control Valve w/Aux Hoist & A/C Hose - A/C Pressure Swing Control Valve w/out A/C Hose - Swing Motor Swing Relief Valve - Swing Motor Hose - Pilot Manifold A2...

  • Page 48: Relief Valve Pressure Setting Procedures

    HYDRAULIC SYSTEM NBT40 SERVICE MANUAL RELIEF VALVE PRESSURE SETTING Release the control lever after taking each reading and while making adjustments. When the proper PROCEDURES pressure setting has been attained, tighten the adjust ment s crew lo cknu t and rech eck the Description pressure.

  • Page 49: System Pressure Check

    NBT40 SERVICE MANUAL HYDRAULIC SYSTEM System Pressure Check Set the boom up relief valve on the main control valve (Figure 2-2 & Figure 2-3) to 24821 ±689 kPa (3600 ±100 Insert a T-connector with a pressure gauge in the hydraulic psi) line at swivel port #3.

  • Page 50: Swing Valve Relief

    HYDRAULIC SYSTEM NBT40 SERVICE MANUAL Swing Valve Relief NOTE: Do not rely on the swing brake to hold the turret in place when checking relief pressures, as the turret may push through the swing brake. Always check pressures by removing and plugging the hydraulic hoses at the swing motor.

  • Page 51: Hydraulic Reservoir And Filter

    NBT40 SERVICE MANUAL HYDRAULIC SYSTEM FIGURE 2-9 Hydraulic Reservoir and Filter A filler cap on the top of the reservoir is for filling the reservoir. The filler cap includes a strainer for catching The reservoir, (Figure 2-10) is attached to the front of the contaminants and gaskets to prevent leaking.

  • Page 52: Hydraulic Filter Replacement

    HYDRAULIC SYSTEM NBT40 SERVICE MANUAL Return Item Component Item Component Filter Cap Hydraulic Reservoir Capscrews (6) Temperature Gauge Magnetic Drain Plug Hydraulic Oil Level Gauge Breather Access Cover Pump Load Sense Drain Fill Cap Swivel Drain Bowl Outrigger Drain Filter Element Gauge Suction to Pump Filter FIGURE 2-10...

  • Page 53: Hydraulic Oil Cooler

    NBT40 SERVICE MANUAL HYDRAULIC SYSTEM Hydraulic Oil Cooler Oil Cooler Service & Maintenance A hydraulic oil cooler (4, Figure 2-11) is located on the boom The heat exchanger must be kept clean to allow for efficient rest (7). The oil cooler return circuit (3) is in parallel with the operation of the cooler system.

  • Page 54: Main Control Valve

    HYDRAULIC SYSTEM NBT40 SERVICE MANUAL Binding Spools component valves, and the optional front jack valve. The rear outrigger manifold contains the rear outrigger component Some of the most common causes for stiff spool movement valves. The valves are operated by solenoids that are or jammed spool action are system overheating, excessive controlled by switches on the outrigger control boxes located pressure, contaminated or deteriorated hydraulic oil, or...

  • Page 55: Installation

    NBT40 SERVICE MANUAL HYDRAULIC SYSTEM Remove the bolts from the pump mounting flange and damage to the pump or other components in the hydraulic slide the pump out of the PTO drive coupling. system. Install pump on PTO following procedures described Installation under Installation, page 2-19.

  • Page 56: Pump Margin Pressure Setting

    HYDRAULIC SYSTEM NBT40 SERVICE MANUAL Table 2-1 Pressure Settings Pump Margin Pressure Maximum Pump Pressure Load Sense Relief Valve Pressure 25.8 bar ±3.4 bar (375 psi ±50 psi) 310 bar -0 +3.4 bar (4500 psi -0+50 psi) 287.8 bar ±6.8 bar (4175 psi ±100 psi) Pump Margin Pressure Setting Load Sense Relief Valve Pressure Setting Install a gauge at the pump pressure gauge port (2) on...
  • Page 57 NBT40 SERVICE MANUAL HYDRAULIC SYSTEM 7590 FIGURE 2-14 National Crane 2-21 Published 8-01-2017 Control # 287-11...

  • Page 58: Trouble Diagnosis

    .118 (3.00) 1 7/8-12 (37.82) (43.69) NOTE: Contact your National Crane Distributor or Manitowoc Crane Care for O-Ring boss seal kits. TROUBLE DIAGNOSIS designed to help isolate the problem and should be checked before calling Manitowoc Crane Care The following chart lists malfunctions which may occur during equipment operation, the possible cause, and the possible solution.
  • Page 59 NBT40 SERVICE MANUAL HYDRAULIC SYSTEM CONDITION POSSIBLE CAUSE POSSIBLE SOLUTION Low hydraulic oil level. Fill reservoir. If the temperature is too high, check the cooler Hydraulic oil temperature too high (thin oil) Slow response. circuit. If the temperature is too low, warm up or too low (thick oil).
  • Page 60 HYDRAULIC SYSTEM NBT40 SERVICE MANUAL CONDITION POSSIBLE CAUSE POSSIBLE SOLUTION Pilot pressure at valve bonnets should be 0.7 to 2.4 Valve spools not fully open. MPa (100 to 350 PSI) so valve has full throw. Plugged diffuser Remove from tank and clean. Boom holding valves out of adjustment or Adjust or clean as required.
  • Page 61 NBT40 SERVICE MANUAL HYDRAULIC SYSTEM CONDITION POSSIBLE CAUSE POSSIBLE SOLUTION Low oil temperature. Allow unit to warm up. Low hydraulic oil supply. Check and fill with crane in travel position. Suction line kinked, collapsed or blocked. Clear blockage. Hydraulic oil too thick. Warm oil or use oil more applicable to environment.
  • Page 62 HYDRAULIC SYSTEM NBT40 SERVICE MANUAL CONDITION POSSIBLE CAUSE POSSIBLE SOLUTION Cables not attached correctly. Reconnect, replace and/or adjust cables. Anti-two block system shut down. Lower hook, and extend load. Defective anti-two block system. Check anti-two block system; repair if defective. Boom will not extend Reduce load or radius until RCL resets and resume Overload causing RCL shutdown.

  • Page 63: Section 3

    Use reported symptoms to identify a problem or a Manitowoc Crane Care requests you have as part of your suspect component. service tool kit inventory the CAN-Link service tool kit for the Use a multimeter to test for circuit continuity if you NBT40.

  • Page 64: Troubleshooting The Electrical Swivel

    ELECTRIC SYSTEM NBT40 SERVICE MANUAL service software and connection cable are available through has power supplied by the truck battery even when the truck Crane Care to those service technicians who have attended ignition is in the OFF position. the Grove New Technology training course. NOTE: Consult the RCL manual in the event of an RCL malfunction.

  • Page 65: Cab Module, Fuse, Relay Panel

    NBT40 SERVICE MANUAL ELECTRIC SYSTEM 7569-11 7569-2 FIGURE 3-1 7569-10 CAB MODULE, FUSE, RELAY PANEL NOTE: The cab control modules and RCL module are not serviceable; contact Crane Care Customer Service The cab and superstructure fuse/relay panel (9, Figure 3-2) with any service or repair questions about the is located behind the operator’s seat.
  • Page 66 ELECTRIC SYSTEM NBT40 SERVICE MANUAL 7600 7569-5 7600-2 FIGURE 3-2 Figure 3-2 Item Numbers Item Component Item Component Fuse Box #1 Access Panel ACC Relay Buzzer, Minimum Wrap Indicator Crane Relay RCL Bypass Key Switch Remote Relay Fuse Box #3 HVAC Relay Fuse Box #2 Published 8-01-2017 Control # 287-11...

  • Page 67: Micro Relay Fuse Box #1

    NBT40 SERVICE MANUAL ELECTRIC SYSTEM Fuse Box #1 • F10 - HVAC Power Relay - 30 amp Fuse Box #2 7602-1 7602-3 FIGURE 3-3 FIGURE 3-4 Micro Relay Fuse Box #1 Micro Relay Fuse Box #2 The micro relay fuse block (4, Figure 3-2) is located on the left side of the fuse relay panel and contains the following The micro relay fuse block (5, Figure 3-2) is located in the components, see Figure 3-3:...

  • Page 68: Micro Relay Fuse Box #3

    ELECTRIC SYSTEM NBT40 SERVICE MANUAL Fuse Box #3 • R1 - Not Used • R2 - Not Used • R3 - Not Used • R4 - Rated Capacity Limiter (RCL) Relay • R5 - Crane Power and Remote Power • F1 - Spare - 7.5 amp •...

  • Page 69: Vec Module

    NBT40 SERVICE MANUAL ELECTRIC SYSTEM Item Relay Truck Ignition Oil Cooler Throttle Control Engine Start Outrigger Power Crane Ignition Outrigger Control FIGURE 3-6 VEC MODULE • Throttle control relay (3) switches the throttle control from the truck to the crane. The radio remote option The Vehicle Electrical Center (VEC) module (8, Figure 3-6) disables this relay when the truck is started with the is located in an enclosure on the boom rest above the front...

  • Page 70: Crane Manifold Solenoids

    ELECTRIC SYSTEM NBT40 SERVICE MANUAL 7587-3 7587-4 7587-2 FIGURE 3-7 Figure 3-7 Item List block conditions. The operations listed below are disabled when the solenoids are energized. Item Solenoid Valve Main Hoist Down Main Hoist Down Main Hoist Up Main Hoist Up Boom Telescope Extend Boom Telescope Cylinder - Extend the Boom Auxiliary Hoist Up (optional)

  • Page 71: Outrigger Manifolds

    NBT40 SERVICE MANUAL ELECTRIC SYSTEM Before replacing a solenoid, check the connector for OUTRIGGER MANIFOLDS corrosion. Clean the connector with fine sand paper and There are two outrigger manifolds located on the carrier l u b r i c a t e w i t h e l e c t r o l y t i c g r e a s e . D o n o t u s e a frame.

  • Page 72: Front Outrigger Manifold

    ELECTRIC SYSTEM NBT40 SERVICE MANUAL Front Outrigger Manifold • The component solenoids (2 through 5) control the front outrigger components. See Figure 3-8 for solenoid The solenoids on the front outrigger manifold control the identification. selection of the front outrigger components, front center jack, •...

  • Page 73: Hydraulic Oil Cooler

    NBT40 SERVICE MANUAL ELECTRIC SYSTEM HYDRAULIC OIL COOLER Not all return flow is routed through the oil cooler. A 206 kPa (30 psi) check valve limits the flow through the cooler. Since The hydraulic oil cooler (3, Figure 3-10) is mounted on the hydraulic oil is thicker when it is cold, less oil is routed boom rest.
  • Page 74 ELECTRIC SYSTEM NBT40 SERVICE MANUAL THIS PAGE BLANK 3-12 Published 8-01-2017 Control # 287-11...

  • Page 75: Four Section Boom

    NBT40 SERVICE MANUAL BOOM MAINTENANCE SECTION 4 BOOM MAINTENANCE SECTION CONTENTS Four Section Boom ......4-1 Additional Maintenance, Disassembled Boom .

  • Page 76: Boom Removal

    BOOM MAINTENANCE NBT40 SERVICE MANUAL BASE 1/2/3 EXTEND 2/3/4 EXTEND 1ST STAGE 2ND STAGE 3RD STAGE 4TH STAGE 3/2/1 RETRACT 4/3/2 RETRACT FIGURE 4-1 Reference Figure 4-1, Figure 4-2, Figure 4-4 and Figure 4-5 Additional Maintenance, Disassembled for Boom Removal, Disassembly, Assembly and Cable Boom Tensioning.

  • Page 77: Cable Tightening Sequence

    NBT40 SERVICE MANUAL BOOM MAINTENANCE When tightening/loosening the first (adjustment) nuts on Measure the extension gaps between each boom cables, secure cable using the wrench flats at the front of the section and scribed line and note values. cable ends to prevent cable twist. Excess twisting of cables Retract boom so that the scribed lines are exposed by can cause premature failure.

  • Page 78: Cable Retention

    BOOM MAINTENANCE NBT40 SERVICE MANUAL retract cables to 8.13 Nm (6 ft lb). Torque 1/2/3 extend Tightening until the retraction gap between the first and cable to 29.83 Nm (22 ft lb). second section and the retraction gap between the second and the third are equal.
  • Page 79 NBT40 SERVICE MANUAL BOOM MAINTENANCE TORQUE VALUES for Second Nut: Inch Series with Coarse Threads (UNC) Minimum Cable end TORQUE Nut Type Thread Size Strength ft lbf GRADE Hex Jam 1/2-13 SAE 2 (HALF) Hex Jam 5/8-11 SAE 2 (HALF) Hex Jam 3/4-10 SAE 2...

  • Page 80: Four Section Top/Bottom Pad Replacement, Assembled Boom

    BOOM MAINTENANCE NBT40 SERVICE MANUAL Four Section Top/bottom Pad Replacement, Remove countersunk capscrews from the top base of the 2nd stage boom wear pad retaining plates and slide Assembled Boom wear pad retaining plates towards the center of boom. Inspect top and bottom wear pads periodically for signs of Mark these retaining plates so they can be reinstalled abrasion or excessive wear.
  • Page 81 NBT40 SERVICE MANUAL BOOM MAINTENANCE other steps apply to boom being removed from crane (See 13. Tag and remove rear wear pads and shims from base of “Boom Removal” on page 4-2). 2nd stage boom if replacing. Extend and set the outriggers and SFO. 14.

  • Page 82: Additional Maintenance, Disassembled Boom

    BOOM MAINTENANCE NBT40 SERVICE MANUAL 24. Place the 3rd, and 4th stage booms on a suitable 31. Pull the 4/3/2 retract-2/3/4 extend pin (77) with cables horizontal surface. (29) as an assembly out of slot in the bottom base of the 4th stage boom and drape out of the base of the 3rd NOTE: Use caution not to pinch or crush retract cables...

  • Page 83: Four Section Boom Assembly

    NBT40 SERVICE MANUAL BOOM MAINTENANCE Clean and inspect all cable assemblies according to wire d. Install spacer (91). rope inspection procedures in this section. Pay Install center sheave assembly (94,95) with grease particular attention to any wire breakage at the end fitting (93) facing either side.
  • Page 84 BOOM MAINTENANCE NBT40 SERVICE MANUAL NOTE: Take care not to damage cables. Install pin assembly (142) through cylinder sheave case securing with keeper plate (150) and two bolts Install bottom wear pad (68) and shims (67) capscrew (81). (69) onto the base of the 4th stage boom (4) if replacing. d.

  • Page 85: 3Rd And 2Nd Section Boom

    NBT40 SERVICE MANUAL BOOM MAINTENANCE (3). Install 4/3/2 retract cable keeper (78) into anchor Slide this center loop from front to back through the plates at the base of the fourth stage boom. cable anchor slot at base, top of the 3rd stage boom (3).
  • Page 86 BOOM MAINTENANCE NBT40 SERVICE MANUAL NOTE: Take care not to cross cables. NOTE: Do not twist cables. Twisting of cables will result in d a m a g e o r f a i l u r e o f c a b l e . W h e n i n i t i a l l y NOTE: Do not twist cables.

  • Page 87: 2Nd And 1St Section Boom

    NBT40 SERVICE MANUAL BOOM MAINTENANCE 27. Install two top wear pad mounting plates (153), wear NOTE: Apply multipurpose grease (MPG) to all wear pads pads (157), with capscrew (156), washer (155) onto the and contact surfaces. base of the 2nd stage boom (2). Install adjusting bolt (104) and jam nut (97) on lower NOTE: Apply multipurpose grease (MPG) to all wear pads...
  • Page 88 BOOM MAINTENANCE NBT40 SERVICE MANUAL 21. Extend boom and align all boom sections. 23. Install boom angle pendulum (121) and bearing (120) to left side of 1st stage boom with hardware (122,56). 22. Install access cover (124) with hardware (125,126) to top rear of 1st stage boom.
  • Page 89 NBT40 SERVICE MANUAL BOOM MAINTENANCE Four Section Boom ‘ 1ST SECTION To Base of 3rd Stage 8222-1 2ND SECTION To Rear Base of 4th Stage 8222-2 FIGURE 4-5 National Crane 4-15 Published 8-01-2017 Control # 287-11...
  • Page 90 BOOM MAINTENANCE NBT40 SERVICE MANUAL Four Section Boom 3rd SECTION To Tip of 1st Stage 8222-3 4th SECTION To Tip of 2nd Stage 8222-5 FIGURE 4-5 4-16 Published 8-01-2017 Control # 287-11...
  • Page 91 NBT40 SERVICE MANUAL BOOM MAINTENANCE Four Section Boom EXTENSION CYLINDER 8222-4 FIGURE 4-5 4 Section Boom 4 Section Boom Item Description Item Description 20 Capscrew Hex Hd-l 1/2-13 x1.50 G8 1st Section Boom - Base Assembly 21 Lock Washer 3/8 2nd Section Boom - Assembly 22 Back Plate 3rd Section Boom - Assembly...
  • Page 92 BOOM MAINTENANCE NBT40 SERVICE MANUAL 4 Section Boom 4 Section Boom Item Description Item Description 39 Wear Pad 83 Sheave 40 Lock Washer 10 84 Bearing 41 Shim 89 Hitch Pin 0.75x7 42 Wear Pad 90 Sheave Pin 43 Grease Fitting 91 Spacer 44 Sheave Anchor Assembly 92 Spacer...
  • Page 93 NBT40 SERVICE MANUAL BOOM MAINTENANCE 4 Section Boom Item Description 141 90 Deg Elbow 142 Pin 143 Capscrew - Socket Button Hd 3/8-16 x0.75 144 Wear Pad 145 Wear Pad 146 Rod 147 Roller 148 Plate 149 Capscrew Socket Flat Hd 3/8-16 x0.63 150 Keeper 151 Capscrew Socket Flat Hd 5/16-18 x0.75 152 Spacer...

  • Page 94: Five Section Boom

    BOOM MAINTENANCE NBT40 SERVICE MANUAL FIVE SECTION BOOM The 3/2/1 retract cables (Figure 4-6) directly oppose the 1/2/ 3 extend cables to ensure that the 2nd and 3rd stage booms A two-stage, rod fed, double-acting cylinder is attached to extend and retract equally at all times. and supports the 1st, 2nd and 3rd stage boom sections.

  • Page 95: Boom Removal

    NBT40 SERVICE MANUAL BOOM MAINTENANCE Reference Figure 4-6, Figure 4-7, Figure 4-8, Figure 4-12 Tag and disconnect the hydraulic lines to the telescope and Figure 4-10 for Boom Removal, Disassembly, Assembly cylinder. Cap all lines and openings. and Cable Tensioning. Loosen and remove two capscrews (11,8) and hardened washers which anchor the 1st stage extend cylinder rod Boom Removal...
  • Page 96 BOOM MAINTENANCE NBT40 SERVICE MANUAL sheave pin with retract sheaves (148) and bearing (35) 25. Tag and remove wear pads and shims from base of 3rd spacers (36) and snap ring (37) assembled back out of stage boom if replacing. its slot at the base of the 2nd stage boom.

  • Page 97: Additional Maintenance, Disassembled Boom

    NBT40 SERVICE MANUAL BOOM MAINTENANCE cables (77) from anchor plate in the bottom base of the 43. Remove the 5/4/3 retract-2/3/4 extend pin (78) from the 5th stage boom and drape outside of base end of 3rd bottom base of the 4th stage boom. Remove the 5/4/3 retract cables (77) from the anchor plates at the bottom stage boom.

  • Page 98: Five Section Boom Assembly

    BOOM MAINTENANCE NBT40 SERVICE MANUAL Clean and inspect all cable assemblies according to wire Install center sheave's (120,121) with grease fitting rope inspection procedures in this section. Pay (95) facing either side. particular attention to any wire breakage at the end Install top sheaves (120,121) to the left hand side of connections.

  • Page 99: 5Th And 4Th Section Boom

    NBT40 SERVICE MANUAL BOOM MAINTENANCE boom and install the button end of the 3/4/5 extend Install cable guide assembly (105) on the top of 4th cables (96) into outer side anchor plates at the base stage boom (4). of the 5th stage boom and pull taunt. Insert upper steel wear pad (102) with shims (139) between 4th stage boom (4) and top of the 5th stage 5th and 4th Section Boom...

  • Page 100: 4Th And 3Rd Section Boom

    BOOM MAINTENANCE NBT40 SERVICE MANUAL NOTE: Apply multipurpose grease (MPG) to all wear pads (146,21,56) on the top front of 3rd stage boom (3). Shim and contact surfaces. according to calibration instructions in this section. 15. Rotate cam (200) until gap is eliminated between wear 10.

  • Page 101: 3Rd And 2Nd Section Boom

    NBT40 SERVICE MANUAL BOOM MAINTENANCE 17. Assemble and install the 5/4/3 retract-2/3/4 extend pin Install one retainer (37) and one washer (36) inside assembly into anchor plate at the bottom base of the 4th of each sheave. stage boom (4). b.
  • Page 102 BOOM MAINTENANCE NBT40 SERVICE MANUAL b. Slide the keeper sheave (71) into this slot from back NOTE: Do not twist cables. Twisting of cables will result in to front so raised portion of sheave slides into slot of d a m a g e o r f a i l u r e o f c a b l e . W h e n i n i t i a l l y cable anchor plate.

  • Page 103: 2Nd And 1St Section Boom

    NBT40 SERVICE MANUAL BOOM MAINTENANCE first nut on past the flat so adjustment can be made NOTE: Apply multipurpose grease (MPG) to all wear pads later. and contact surfaces. 20. Lock cable anchor assembly (30) in place with 28. Install adjustment cam plate (200), capscrews (199) and capscrews (27) through the top back side plates of the flatwashers (196).
  • Page 104 BOOM MAINTENANCE NBT40 SERVICE MANUAL 37. Install adjusting bolt (70) and jam nut (111) on lower front 43. It is important in this step to have the nuts loose on the 3/ side of 1st stage boom. Install wear pad retaining 2/1 retract cables (19) at the bottom tip of the 1st stage hardware (61,62,63) in wear pad pocket.
  • Page 105 NBT40 SERVICE MANUAL BOOM MAINTENANCE Five Section Boom 1st SECTION 8176-1 2nd SECTION 8176-2 FIGURE 4-8 National Crane 4-31 Published 8-01-2017 Control # 287-11...
  • Page 106 BOOM MAINTENANCE NBT40 SERVICE MANUAL Five Section Boom 3rd SECTION 8176-3 Extension Cylinder 8176-4 FIGURE 4-8 4-32 Published 8-01-2017 Control # 287-11...
  • Page 107 NBT40 SERVICE MANUAL BOOM MAINTENANCE Five Section Boom 4th SECTION 97 98 8176-5 5th SECTION 8176-6 FIGURE 4-9 National Crane 4-33 Published 8-01-2017 Control # 287-11...
  • Page 108 BOOM MAINTENANCE NBT40 SERVICE MANUAL Five Section Boom Five Section Boom Item Description Item Description 43 Grease Fitting 1st Section Boom - Base Assembly 44 Sheave Anchor Assembly 2nd Section Boom Assembly 45 Bearing 3rd Section Boom Assembly 46 Sheave 4th Section Boom Assembly 47 Pin 5th Section Boom Assembly...
  • Page 109 NBT40 SERVICE MANUAL BOOM MAINTENANCE Five Section Boom Five Section Boom Item Description Item Description 86 Hex Jam Nut 1-1/2-6unc Sae-2 131 Retaining Ring 1.5 87 Spacer 132 Flatwasher 1.5x2.25x0.7 88 Wear Pad 133 Hex Nut 3/8-16unc 89 Wear Pad 134 Wear Pad 90 Shim 135 Shim...

  • Page 110: Five Section Cable Tensioning

    BOOM MAINTENANCE NBT40 SERVICE MANUAL Five Section Cable Tensioning Five Section Boom Item Description After boom reassembly or from time to time if interior 176 Hex Head Capscrew M6x70 proportioning cables appear loose, cable tensioning may be required. 177 Flatwasher 6 178 Keeper Side Wear Pad Tensioning Setup Procedure 179 Side Wear Pad...

  • Page 111: Cable Tightening Sequence

    NBT40 SERVICE MANUAL BOOM MAINTENANCE Cable Tightening Sequence b. If 3rd section is bottoming out first, equally loosen 3/ 2/1 retract cables and tighten 1/2/3 extend cables Cycle boom approximately 3 m (10 ft) out and in a few and retract the boom a few feet. Torque 3/2/1 retract times (.75 m, 2.5 ft per section).

  • Page 112: Cable Retention

    BOOM MAINTENANCE NBT40 SERVICE MANUAL OPTION 1 OPTION 2 8859-1 8859-2 FIGURE 4-11 Cable Retention After the cable adjustment procedure is completed for the entire boom assembly. The second (torqued) nut must be Cable Retention Hardware installed on all retract and extend cables. The second nut should be hand tightened until it comes in Item Description...

  • Page 113: Five Section Top/Bottom Pad Replacement, Assembled Boom

    NBT40 SERVICE MANUAL BOOM MAINTENANCE TORQUE VALUES for Second Nut: Inch Series with Coarse Threads (UNC) Minimum Cable end TORQUE Nut Type Thread Size Strength ft lbf GRADE Hex Jam 1/2-13 SAE 2 (HALF) Hex Jam 5/8-11 SAE 2 (HALF) Hex Jam 3/4-10 SAE 2...
  • Page 114 BOOM MAINTENANCE NBT40 SERVICE MANUAL the lubricating plugs in the wear pads also be replaced with tips to relieve pressure on wear pads on the top base of new plugs. These new lube plugs initially extend 0.06 above the 4th and 5th stage booms. the pad surface and will wipe a long lasting coating of 10.

  • Page 115: Boom Calibration

    NBT40 SERVICE MANUAL BOOM MAINTENANCE BOOM CALIBRATION INSIDE OUTSIDE FIGURE 4-15 CALIPERS FIGURE 4-13 Inner Side Pads With a pair of inside/outside calipers, measure the inside Top/rear Wear Pads width of the outer section (W ) at the front and back of With a pair of inside/outside calipers, measure the inside the boom within 3 in of the bottom plate and record the width of the outer section (W...

  • Page 116: Rear, Bottom Pads

    BOOM MAINTENANCE NBT40 SERVICE MANUAL Measure the thickness of the wear pads and record With the tape measure, measure the outside height of (twp), the inner section (H ) at bottom, rear pad location. Record the largest measurement. FIGURE 4-18 Subtract the outside width (W ) of the inner section and the thickness of the two pads (twp) from the inside width...

  • Page 117: Multi-Stage Extend Cylinder

    NBT40 SERVICE MANUAL BOOM MAINTENANCE EXAMPLE = 19.38 AT FRONT 19.38 AT BACK NEAR CYLINDER ANCHOR BARS = 17.88 FIGURE 4-22 19.38 -17.88 - 0.75 -twp - 0.50 -twp 0.25 Clearance - 0.19 Bottom shims Final Clearance 0.06 MULTI-STAGE EXTEND CYLINDER 3RD STAGE 2ND STAGE 1ST STAGE...

  • Page 118: Cylinder Reassembly

    BOOM MAINTENANCE NBT40 SERVICE MANUAL do not move equally, retain the moving stage to allow for proper size spanner wrench tighten piston onto 1st stage equal extension of cylinder. Remove the holding valve cylinder shaft assembly to 600 lb-ft. from the 1st stage butt plate and drain oil. Install setscrew into piston using Loctite Type 243 Using the proper size spanner wrench (listed on the according to Loctite recommendations and torque to...
  • Page 119 NBT40 SERVICE MANUAL BOOM MAINTENANCE Use the following procedure to make adjustments to the jib Loosely bolt the hook assembly to the side of the first stowage bracket. boom section, Figure 4-25. Before beginning this procedure read and understand the following DANGER decal.
  • Page 120 BOOM MAINTENANCE NBT40 SERVICE MANUAL supported by the jib ears. The jib will typically rest only on the upper support, Figure 4-28. STOW HOOK ON BOOM SHIMS BOOM RAMP ON JIB UPPER SUPPORT EARS BOOM LOWER STOW PIN SUPPORT FIGURE 4-30 CAUTION Make sure the ramp slides up the stow hook and does not hit the end of the ramp...

  • Page 121: Jib Jack Service And Maintenance

    NBT40 SERVICE MANUAL BOOM MAINTENANCE 14. Extend and retract the boom and jib to ensure proper Adding Oil alignment of jib stow brackets. With saddle fully lowered and piston depressed, set jack 15. Install jib stow pins and remove jib pins. Always save in its upright level position and remove oil filler plug.
  • Page 122 BOOM MAINTENANCE NBT40 SERVICE MANUAL THIS PAGE BLANK 4-48 Published 8-01-2017 Control # 287-11...

  • Page 123: Description

    NBT40 SERVICE MANUAL HOIST SECTION 5 HOIST SECTION CONTENTS Description ........5-1 Programming the Minimum Wrap Indicator.

  • Page 124: Hoist Removal

    HOIST NBT40 SERVICE MANUAL Hoist Removal Remove the hoist (4,7 Figure 5-1) from the crane with the lifting device. Hydraulic Hoses CAUTION Inspect the hoist hydraulic hoses (17, 18 & 23, Figure 5-1) The combined weight of the hoist and 390 ft. of wire rope for cracks or damage that may cause leaks.
  • Page 125 NBT40 SERVICE MANUAL HOIST 7582 FIGURE 5-1 Figure 5-1 Item Numbers Item Component Item Component Cover Elbow Flatwasher Union HHCS Washer Main Hoist Washer Washer (8 places) HHCS (8 places) 5/8-11UNC Boom Auxiliary Hoist Washer Cable, 5/8 Union National Crane Published 8-01-2017 Control # 287-11...

  • Page 126: Hoist Rotation Indicator (Hri) Display System

    HOIST NBT40 SERVICE MANUAL Item Component Item Component Tube, Lower Elbow, 90 Tube, Raise Brake Adapter Case Drain Hose Motor Elbow, 90 worn or damaged; replace it. HRI Display The display is located in the front overhead panel Figure 5-3. Hoist Rotation Indicator (HRI) Display System To replace the display, remove the overhead panel.

  • Page 127: Drum Rotation Indicator

    NBT40 SERVICE MANUAL HOIST bulkhead using double-sided adhesive tape. To remove the DRUM ROTATION INDICATOR module, pry it off the bulkhead. Remove any residual tape The Drum Rotation Indicator (DRI) and Minimum Wrap from the bulkhead. Secure the replacement module to the Indicator (MWI) are integrated into one monitoring system bulkhead with the foam tape.

  • Page 128: Installation

    HOIST NBT40 SERVICE MANUAL Installation 8640-1 FIGURE 5-7 8640-2 To install the DRI, use the following procedure: Insert the DRI into the drum. Rotate the DRI (1, Figure 5-7) so that the DRI shaft (2) engages the drive inside the drum. Push the DRI into the drum so that the notch is lined up with the breather (3, Figure 5-6).

  • Page 129: Shipping Mode

    NBT40 SERVICE MANUAL HOIST Push and gently hold the programming button (3, Shipping Mode Figure 5-9) return power If the programming button is held down for more than 15 reconnecting the DRI cable. seconds, the HMS will enter "Shipping Mode." The HMS NOTE: Use an Allen Wrench or other small tool with a flat, rapidly pulses the "Warning"...

  • Page 130: Assembly (Refer To Figure 5-10)

    HOIST NBT40 SERVICE MANUAL removing four capscrews (Item 47). See Servicing The Attach the output shaft (Item 32) to the side plate (Item Motor section on page 10 for motor and counterbalance 29) with six capscrews (Item 9), making sure the vent valve disassembly.
  • Page 131 NBT40 SERVICE MANUAL HOIST are in the correct orientation. Also, make sure that the specification (see “Fasteners And Torque Values” on level and vent plugs in the cover are properly oriented. page 1-7 of this manual). Install eight capscrews (Item 9) and torque them to 17.
  • Page 132 HOIST NBT40 SERVICE MANUAL Hoist Parts List Item Description Item Description CAPSCREW 36-2 Planet Gear Support rod 36-3 Planet Pin Counterbalance Block 36-4 Retaining Ring Gear Set 36-5 Plate 36-6 Needle Bearing Carrier Planet Gear 36-7 Fitting, Str Adapter Planet Pin Capscrew Retaining Ring Input Driver...
  • Page 133 NBT40 SERVICE MANUAL HOIST FIGURE 5-10 National Crane 5-11 Published 8-01-2017 Control # 287-11...

  • Page 134: Brake

    HOIST NBT40 SERVICE MANUAL Brake install the input sun gear (Item 38) into the brake housing and slide the driver/clutch assembly onto the Refer to Figure 5-10 and the Hoist Parts List on page 5-10 sun gear spline. for the following brake service steps. 12.

  • Page 135: Planetary Set

    NBT40 SERVICE MANUAL HOIST Planetary Set Motor NOTE: See Figure 5-10 for item number (#) identification. NOTE: See Figure 5-10 for item number (#) identification. Remove the spiral retaining rings (4-4, 36-4) from the Remove and tag hoses. planet pins. Remove the counterbalance block (3) from the motor Remove the pins (4-3, 36-3) from the carrier by carefully assembly by removing 4 capscrews (31).
  • Page 136 HOIST NBT40 SERVICE MANUAL THIS PAGE BLANK 5-14 Published 8-01-2017 Control # 287-11...

  • Page 137: Description

    NBT40 SERVICE MANUAL SWING SECTION 6 SWING SECTION CONTENTS Description ........6-1 Swing Bearing .

  • Page 138: Swing Brake

    SWING NBT40 SERVICE MANUAL Swing Brake Swing Gear Box Assembly Hydraulic power for the swing brake control is supplied by the crane manifold and swing brake pedal valve. The hydraulic power for the swing brake release is supplied by swing brake release solenoid on the crane manifold.
  • Page 139 NBT40 SERVICE MANUAL SWING Outer Planetary Gear Inner Planetary Gear FIGURE 6-2 Item Component Item Component Cap Screw (8) Housing Drain Plugs Output Shaft Plate Seal Retaining Washer Lower Bearing Output Planetary Pin Lower Bearing Race Washer Upper Bering Race Needle Bearing Upper Bearing Spacer...

  • Page 140: Swing Gearbox And Brake

    SWING NBT40 SERVICE MANUAL SWING GEARBOX AND BRAKE • Gear puller • Ratchet wrench (1/2” drive) The rotation drive is a double planetary gear reducer with an integral brake. The gear reducer is designed to give long life in • 9/16”...

  • Page 141: Input Planetary Repair

    NBT40 SERVICE MANUAL SWING Tapered bearing (4) may be removed from output shaft CAUTION (2) using a gear puller. The locknut is no longer retaining the output shaft. Care Remove old seal (3) and discard. Grease pack the lower should be taken when moving the gear housing because bearing (4) with lithium grease or EP lube and install into the output shaft can fall out.

  • Page 142: Swing Brake

    SWING NBT40 SERVICE MANUAL method involves increasing press load on the bearings 20. Put pipe sealant on the other pipe plug (17) and install (4 and 7) until drag or rolling resistance of 75 - 85 in-lb the plug in the top hole in the gear housing (1). (8.4 - 9.6 N·m) is achieved when rotating the case.
  • Page 143 NBT40 SERVICE MANUAL SWING FIGURE 6-3 Item Component Item Component O-ring Stator Plates Housing Friction Discs Seal Backup Ring Bearing O-ring Backup Ring O-ring O-ring Backup Ring O-ring Park Brake Piston Backup Ring Springs Brake Piston O-ring Retaining Ring Cover Brake Driver Capscrews (8) Retaining Ring...

  • Page 144: Assembly

    SWING NBT40 SERVICE MANUAL Assembly cover is tight against the brake housing. Torque the capscrew to 30 - 35 ft-lb (41 - 47 N·m). (See Figure 6-3 for reference numbers.) SWING BEARING Assembly is in reverse order of disassembly with the following additional instructions.

  • Page 145: Swing Bearing Bolts

    NBT40 SERVICE MANUAL SWING a high strength bolt is removed, or un-torqued, the bolt must When using step wrenches, calculated wrench settings are be replaced with a new bolt of the same classification. valid only when the following conditions are met. Torque wrenches must be those specified and forces KNOW YOUR TORQUE WRENCH! Flexible beam type must be applied at the handle grip.
  • Page 146 SWING NBT40 SERVICE MANUAL 7582-2 30 29 FIGURE 6-5 FIGURE 6-6 6-10 Published 8-01-2017 Control # 287-11...

  • Page 147: Bearing Clearance

    NBT40 SERVICE MANUAL SWING Outer Race Torquing Set the dial indicator at zero. The outer race bolts (1, Figure 6-7) are located on top of the Raise the boom about 76mm (3 in) above the boom rest. bearing. Record the deflection indicated on the dial. Extend and set the outriggers.

  • Page 148: Bearing Replacement

    SWING NBT40 SERVICE MANUAL FIGURE 6-9 BEARING REPLACEMENT Slowly rotate the boom back to 20° off front position. Elevate the boom slightly and shut down the engine. Removal Tag and disconnect the battery cables. Fully extend and set the outriggers enough to take up Remove the boom and lift cylinder following the the slack in the pads.

  • Page 149: Installation

    NBT40 SERVICE MANUAL SWING Carefully lower the turret into position on the bearing plate. Be careful not to damage the swivel assembly. DANGER Ensure the lifting device is capable of supporting the boom assembly. 13. Remove the remaining bolts and washers securing the swing bearing outer race to the carrier.

  • Page 150: Slew Potentiometer Adjustment

    SWING NBT40 SERVICE MANUAL FIGURE 6-11 Slew Potentiometer Adjustment Disengage the swing brake and swing approximately 10° to the left (counterclockwise). Slowly swing back to The slew potentiometer is a component of the hydraulic and over the front and set the swing brake. electric swivel assembly which is mounted inside the superstructure turret.

  • Page 151: Removal

    NBT40 SERVICE MANUAL SWING Pressing the pedal down allows the lock to engage the turret Attach the cable (4, Figure 6-12) to the swing lock (5) bearing ring teeth; releasing the pedal disengages the lock from with clevis pin (1), cotter pin (2) and washer (3). the bearing ring teeth.
  • Page 152 SWING NBT40 SERVICE MANUAL 7589-2 9,11 7589-1 7589-3 FIGURE 6-12 6-16 Published 8-01-2017 Control # 287-11...

  • Page 153: Description

    NBT40 SERVICE MANUAL OUTRIGGERS SECTION 7 OUTRIGGERS SECTION CONTENTS Description ........7-1 Outrigger Calibration .
  • Page 154 OUTRIGGERS NBT40 SERVICE MANUAL Section Beam Section Beam Top Cable Adjustment Outrigger Lock Pin Extend Cylinder Anchor Bolts Stabilizer Bottom Cable Adjustment Outrigger Float FIGURE 7-1 Hydraulic LInes Published 8-01-2017 Control # 287-11...
  • Page 155 NBT40 SERVICE MANUAL OUTRIGGERS FIGURE 7-2 Extend/Retract Cables Top Cable Adjustment Trunnion Hydraulic Hoses Cable Sheaves on 2 Section Hydraulic Hose Reel on the Nose of the Extend Cylinder Anchor Brackets Hydraulic Tubes to Cable Sheaves on Stabilizer Cylinder the Nose of the Extend Cylinder Extend Cylinder Hydraulic Hose...

  • Page 156: Removal

    OUTRIGGERS NBT40 SERVICE MANUAL Removal Raise the 1 section outrigger beam assembly against the outrigger box. Remove and tag the bottom wear pad and shims from the outrigger box. Wear Pad Bolts Mark the position and remove the retaining nuts from the Outrigger Box proportioning cable stops at the bottom of the outrigger box.

  • Page 157: Assembly

    NBT40 SERVICE MANUAL OUTRIGGERS 22. Properly support the stabilizer cylinder from the bottom Install holding valve on stabilizer cylinder. with a floor jack or hoist and remove the holding valve Install hydraulic fittings and tubes on the holding valve. and o-rings. Install the wear pads and shims to 2 section beam.

  • Page 158: Cable Tensioning

    OUTRIGGERS NBT40 SERVICE MANUAL CABLE TENSIONING the section and record the smallest measurement. With outriggers assembled, cycle the outriggers and NOTE: Method of Calibration is the same for section the 1 front stabilizer through full extension and retraction for or 2 of the outrigger. five complete cycles to remove air in cylinders.
  • Page 159 NBT40 SERVICE MANUAL OUTRIGGERS section when shims and pads are installed. See Repeat procedure when installing 1st/2nd outriggers example. into outrigger boxes subbase. EXAMPLE = 12.12 AT FRONT 12.06 AT BACK 1ST SECTION = 10.94 AT TOP REAR PAD LOCATION = 11.00 AT TOP FORWARD PAD LOCATION = 10.94 AT BOTTOM REAR...

  • Page 160: Top And Bottom Pads

    OUTRIGGERS NBT40 SERVICE MANUAL Top And Bottom Pads the outer section. Add shims as required (each shim is 0.03 or 0.06 thick) to tighten the pads so that there is With a pair of inside/outside calipers, measure the inside 0.003 - 0.006 clearance between the widest part of the height of the outer section (Hi, Figure 7-11) three ft from inner outrigger and the most narrow part of the outer the front of the section and record.

  • Page 161: String Potentiometer

    NBT40 SERVICE MANUAL OUTRIGGERS String Potentiometer Install Fully retract outrigger. Remove Using screws, mount the string potentiometer to the Fully retract outrigger beam. outrigger box cover. Remove outrigger box cover Connect electrical connector to string potentiometer. Disconnect spring clip from its attaching point on Attach spring clip to attaching point on outrigger beam.
  • Page 162 OUTRIGGERS NBT40 SERVICE MANUAL THIS PAGE BLANK 7-10 Published 8-01-2017 Control # 287-11...

  • Page 163: General

    In general, petroleum based fluids developed especially for Potentially harmful waste used in Manitowoc cranes includes low temperature service may be used with satisfactory — but is not limited to — oil, fuel, grease, coolant, air results.

  • Page 164: Chassis Grease

    NBT40 SERVICE MANUAL suitability of a specific fluid, check with your authorized Open Gear Lubricant National Cranes distributor or Manitowoc Crane Care. This is a special high-graphite adhesive lubricant that helps NOTE: All fluids and lubricants may be purchased by...

  • Page 165: Arctic Hydraulic Oil

    ISO 17/14 or better cleanliness Arctic Hydraulic Oil level and must meet John Deere Standard JDM J20C. Contact your National Crane distributor or Manitowoc Crane Temperature Down to -9°C (15°F) to -29°C (-20°F) Care if you have any questions.
  • Page 166 Each lubrication point is numbered, and this number corresponds to the index number shown on the Lubrication Table 8-1 Manitowoc Lube Specification Symbol Description Cold Weather - Standard 40°C (-40°F)
  • Page 167 NBT40 SERVICE MANUAL LUBRICATION Lubrication Points Grease Tube Opposite side 7471-1 FIGURE 8-1 Table 8-2 Recommended Item Application Procedure Frequency Lubricant Weekly As Required Semi- Hydraulic oil reservoir Hydraulic Oil Check fill change Annually After first 40 Hrs. As indicated by Oil filter, Hydraulic oil reservoir Change or clean gauge thereafter.
  • Page 168 LUBRICATION NBT40 SERVICE MANUAL Recommended Item Application Procedure Frequency Lubricant Turntable bearing EP-MPG Grease gun Weekly Chassis Grease Change After First 100 Operating Pump Drive U-Joint - 2 ea. (If Equipped) Check and Fill Change Hours Coupling Lube Weekly Pump Spline Shaft (Direct Mount) Semi-Annually Spline Lubricant After First 100 Operating...

  • Page 169: Internal Cable Sheave Lubrication

    NBT40 SERVICE MANUAL LUBRICATION Internal Cable Sheave Lubrication Raise the boom to 75°. Extend and retract the boom several times until the grease is evenly spread. DANGER Repeat as necessary. Do not, under any circumstances, work at an elevated height without using proper fall protection as required by Outrigger Beam Lubrication local, state or federal regulations.

  • Page 170: Hoist Gearbox Oil

    -23° C to 66° C (-10° F to +150° F). For resulting in serious injury or death. operation outside this range, contact Manitowoc Crane Care for recommendations. Published 8-01-2017 Control # 287-11...
  • Page 171 NBT40 SERVICE MANUAL LUBRICATION FIGURE 8-4 8640-1 National Crane Published 8-01-2017 Control # 287-11...

  • Page 172: Swing Gearbox And Brake Oil

    Gearbox lubricants are satisfactory for standard operation in AIR CONDITIONING temperatures from -23° C to 82° C (-10° F to +180° F). For operation outside this range, contact Manitowoc Crane Care When servicing air conditioner, evacuate system prior to for recommendations.
  • Page 173 NBT40 SERVICE MANUAL LUBRICATION • of a viscosity capable of penetrating the interstices • dripping between wires and strands. • pouring • not be soluble in the medium surrounding it under the • swabbing actual operating conditions (i.e. Water). • painting •...

  • Page 174: Carwell® Rust Inhibitor

    While the surfaces of the crane that are easily seen have the biggest impact on the appearance of the crane, particular Manitowoc Crane Group's cranes are manufactured to high attention should be given to the undercarriage of the crane to quality standards, including the type of paint finish minimize the harmful effects of corrosion.

  • Page 175: Inspection And Repair

    • Prepare the surface prior to applying the finish coat of paint. Please contact Manitowoc Crane Care should you have any questions. National Crane 8-13 Published 8-01-2017 Control # 287-11...

  • Page 176: Areas Of Application

    LUBRICATION NBT40 SERVICE MANUAL Areas of Application • Superstructure applications are; hose end and fittings, wire rope on hoist roller tensioning springs on hoists, all Refer to Figure 8-8 unpainted fasteners and hardware, valves, slew ring fasteners and all bare metal surfaces. •...
  • Page 177 NBT40 SERVICE MANUAL LUBRICATION 7650-52 7650-53 FIGURE 8-8 National Crane 8-15 Published 8-01-2017 Control # 287-11...
  • Page 178 LUBRICATION NBT40 SERVICE MANUAL Item Description Headache Ball/Hook block Item Description O/R Pins, Clips Hoist Plumbing Connections Mirror Mounting Hardware Tension Spring Powertrain Hardware Counterweight Pins O/R Hose Connections All Hardware, Clips, Pins, Hose Connections not painted O/R Pins, Clips Entire underside of unit Valvebank, Hose Connections inside turntable Turntable Bearing Fasteners...
  • Page 179 NBT40 SERVICE MANUAL CRANE INSTALLATION SECTION 9 CRANE INSTALLATION SECTION CONTENTS General ........9-1 Positioning the Crane On the Truck .
  • Page 180 CRANE INSTALLATION NBT40 SERVICE MANUAL The wheelbase, CT and chassis weights shown are Additional Equipment. In addition to the axle ratings, required so the basic NBT40 can be legally driven in all wheelbase, cab-to-axle requirements and frame, it is states and meet stability requirements. The dimensions recommended that the truck is equipped with electronic given assume the sub-base is installed properly behind engine control, increased cooling and a transmission...
  • Page 181 NBT40 SERVICE MANUAL CRANE INSTALLATION Typical Serial Number Location FIGURE 9-1 Sub Base Turret 1st Section Boom 4th Section Boom 2nd Section Boom 5th Section Boom 3rd Section Boom Lift Cylinder National Crane Published 8-01-2017 Control # 287-11...

  • Page 182: Mounting Configurations

    CRANE INSTALLATION NBT40 SERVICE MANUAL MOUNTING CONFIGURATIONS Configuration With Tag Axle 60,000 GVWR (103/127 ft) Boom – NBT40 and NBT45 FRONT STABILIZER TAG Axle 97 MIN (FOR 42,000 GAWRR ON BRIDGE LAW) 101 MIN 28 MIN 168 MIN 246 WB 282 APPROX.

  • Page 183: Configuration With Pusher Axle 58,000 Lb Gvwr, 103/127 Ft Boom - Nbt40 And Nbt459-5

    NBT40 SERVICE MANUAL CRANE INSTALLATION Gross Vehicle Weight Rating (GVWR) is dependent on all All mounting data is based on a National Series NBT40 with components of the vehicle (axles, tires, springs, frame, etc.) subbase and an 85 percent stability factor. meeting manufacturers' recommendations;...

  • Page 184: Configuration With Extended T-Box - Nbt40-127 And Nbt45-127

    CRANE INSTALLATION NBT40 SERVICE MANUAL • Estimated Final Weight with the following machine Gross Vehicle Weight Rating (GVWR) is dependent on all configuration. components of the vehicle (axles, tires, springs, frame, etc.) meeting manufacturers' recommendations; always specify NBT40 (Wet) - 57,500 lb and NBT 45 (Wet) - 61,000 lb GVWR when purchasing trucks.
  • Page 185 NBT40 SERVICE MANUAL CRANE INSTALLATION • Minimum truck and pusher weight required for stability Figure 9-4 shows the 360° working area. See “Truck Frame (truck with pusher axle raised). Strength” section for truck frame strength required for mounting crane. 22,798 lb gross Gross Vehicle Weight Rating (GVWR) is dependent on all 10,468 lb front axle components of the vehicle (axles, tires, springs, frame, etc.)

  • Page 186: Configuration With Tag Axle 60,000 Lb Gvwr, 142 Ft Boom - Nbt40 And Nbt459-8

    CRANE INSTALLATION NBT40 SERVICE MANUAL Configuration With Tag Axle 60,000 lb GVWR, 142 FT Boom – NBT40 and NBT45 FRONT STABILIZER 97 MIN (FOR 42,000 GAWRR ON BRIDGE LAW) 168 MIN 101 MIN 28 MIN 258 WB 298 APPROX. ROTATION 331 MIN (FOR 60,500 GVWR 360°...
  • Page 187 NBT40 SERVICE MANUAL CRANE INSTALLATION Diesel engines require a variable speed governor and energize-to-run fuel solenoid for smooth crane operation; electronic fuel injection is required. All mounting data is based on a National Series NBT40 with subbase and an 85 percent stability factor. Complete unit must be installed in accordance with factory requirements, and a test performed to determine actual stability and counterweight requirements;...

  • Page 188: Configuration With Tag Axle 94,000 Gvwr, 103 Ft Boom - Nbt45Tm

    CRANE INSTALLATION NBT40 SERVICE MANUAL Configuration With Tag Axle 94,000 GVWR, 103 ft Boom – NBT45TM Optional Front Stabilizer for 360 degree Capacity Working Area 136 MIN 90 MIN 108 MIN 233 MIN 88 MIN 315 MIN WB 279 MIN 7708 APPROX.

  • Page 189: Configuration With 103/127 Ft Boom - Nbt36

    NBT40 SERVICE MANUAL CRANE INSTALLATION Configuration With 103/127 ft Boom – NBT36 FRONT STABILIZER 92 MIN 180 MIN 28 MIN 258 MIN 20 MIN (24 TYP) 360° Full Capacity Working Area FIGURE 9-7 with 103/127 ft boom) shown in in excess of 54,000 lb. In some states special Mounting configuration ( permits for overload are required.

  • Page 190: Pto Requirements

    CRANE INSTALLATION NBT40 SERVICE MANUAL PTO REQUIREMENTS The speeds shown below are optimum operating speeds. The engine must be operated at a speed such that the Horsepower horsepower developed is adequate to run the pump under pressure and provide the required flow. The crane is equipped with a piston hydraulic pump (1, Select as slow as an engine speed as possible to reduce fuel Figure 9-8) that supplies 75 gpm to the crane functions.

  • Page 191: Truck Frame Strength

    NBT40 SERVICE MANUAL CRANE INSTALLATION The Section Modulus (S.M.), which determines the rigidity of the frame, is a measurement of the cross-sectional area of FIGURE 9-9 the truck frame. Resistance to bending moment (RBM) is a measurement of strength and is determined by multiplying the section modulus of each frame rail by the yield strength of the rail material.
  • Page 192 CRANE INSTALLATION NBT40 SERVICE MANUAL NOTE: All dimensions are inches (centimeters) (304) (274) (243) (213) (182) (152) Distance From SFO Attachment (121) Inches (centimeters) (91) (61) (30) FIGURE 9-10 The following tables (A,B,C,D) determine the section the added strength provided by the angle. Add this to the modulus of the truck frame.
  • Page 193 NBT40 SERVICE MANUAL CRANE INSTALLATION If you have any questions concerning frame strength or reinforcing, contact National Crane before proceeding. TABLE A Section Modulus in Thickness 3/16 in. (4.76 mm) Thickness 1/4 in. (6.35 mm) W in. (mm) W in. (mm) D in.
  • Page 194 CRANE INSTALLATION NBT40 SERVICE MANUAL TABLE B Section Modulus in Thickness 3/16 in. (4.76 mm) Thickness 1/4 in. (6.35 mm) W in. (mm) W in. (mm) D in. (mm) D in. (mm) 2.75 (70) 3.25 (83) 3.75 (95) 4.25 (108) 2.75 (70) 3.25 (83) 3.75 (95)
  • Page 195 NBT40 SERVICE MANUAL CRANE INSTALLATION TABLE D Section Modulus in Thickness 1/4 in. (6.35 mm) Thickness 3/16 in. (4.76 mm) W in. (mm) W in. (mm) D in. (mm) D in. (mm) 3 (76) 3.5 (89) 4 (102) 4.5 (114) 3 (76) 3.5 (89) 4 (102)

  • Page 196: Truck Preparation

    CRANE INSTALLATION NBT40 SERVICE MANUAL TRUCK PREPARATION If mounting flanges integral to the PTO are used, the pump can be mounted directly to the PTO. Be sure adequate clearance exists for this type of pump mount. Plan the installation of the crane location for: If a drive line is used, locate the pump no more than •...

  • Page 197: Reinforcing After Frame Extension

    NBT40 SERVICE MANUAL CRANE INSTALLATION • Remove the dust covers from the pump inlet and outlet that the rivets make an impression on the inside of the ports. Verify that the suction and pressure sides of the reinforcing. pump are correct while rotating the pump in the same Mark the approximate location of the crane mounting direction as the PTO.
  • Page 198 CRANE INSTALLATION NBT40 SERVICE MANUAL FIGURE 9-12 Figure 9-12 Item Numbers Item Description Crossmember bolt holes. Shift the plug weld holes slightly to clear the crossmember holes. Planned location of mounting plate. Plug weld locations can be shifted to clear plate. Clearance holes for rivets on weld or on reinforcement.
  • Page 199 NBT40 SERVICE MANUAL CRANE INSTALLATION If the frame through the rear suspension does not meet If reinforcing angle (1, Figure 9-14) is welded to truck the minimum specifications for RBM and section frame, cut out plug weld hole pattern as in Figure 9-12. modulus, it can be reinforced by adding a reinforcing Slide the reinforcing angle (1, Figure 9-14) up from the angle as shown in Figure 9-14.
  • Page 200 CRANE INSTALLATION NBT40 SERVICE MANUAL 6 - 6 12 - 6 6 " 6" 6" 6" FIGURE 9-14 10. The NBT40 needs an after frame of about 92 inches is too long, cut off the ex ces s and remove any (233 cm).

  • Page 201: Mounting The Crane

    NBT40 SERVICE MANUAL CRANE INSTALLATION MOUNTING THE CRANE Align and position each lower mounting plate (3, Figure 9-15) directly below the upper mounting plates (1). DANGER Drill four 5/8 holes through the truck frame. Use existing holes (4, Figure 9-15) in the lower mounting plate (3) to It is mandatory that swing bearing and T-box attaching locate holes in the truck frame (6).
  • Page 202 CRANE INSTALLATION NBT40 SERVICE MANUAL 7609 7610-1 20.0 to 32.0 5.0 to12.0 4 x 8.50 FIGURE 9-15 9-24 Published 8-01-2017 Control # 287-11...

  • Page 203: Truck Interface Electrical Connection

    NBT40 SERVICE MANUAL CRANE INSTALLATION 76010-6 7610-5 0.38 in (380 mm) No Weld 1 in (254 mm) 9 (4, 5/8” O) 7.5 in (19 cm) FIGURE 9-16 Truck Interface Electrical Connection • The accessory and ignition wires are tied into the back of the ignition switch in the truck cab.
  • Page 204 CRANE INSTALLATION NBT40 SERVICE MANUAL • The start wire must be tied to starter solenoid on the • Use crane rear marker wiring harness (not shown in engine side of the firewall. Do not tie the start wire into Figure 9-15) to connect to the truck rear lights. Connect back of truck key switch.

  • Page 205: Hydraulic Pump Connection

    NBT40 SERVICE MANUAL CRANE INSTALLATION Do not locate the pump more than 42 inches (107 cm) from the PTO. Do not exceed a 7° drive line angle and Crane Rear Maker Lights (Not Shown in Figure 9-17) the U-joints on both ends of the drive shaft must be Wire # Truck Function parallel with each other.

  • Page 206: Rcl Calibration

    CRANE INSTALLATION NBT40 SERVICE MANUAL Figure 9-18 item Numbers • Operate the control valves slowly with the truck engine at idle and cycle each cylinder through Item Description its.complete stroke each time. Hydraulic Pump • Check to see that the movement of the outriggers Case Drain Hose and boom correspond with the direction indicated Hose - Swivel Port 3...
  • Page 207 NBT40 SERVICE MANUAL CRANE INSTALLATION Rated Load Table Always refer to the load capacity chart provided with your machine for boom length, radius and Model Boom Length Loaded Radius capacity. 40103 EXAMPLE: Test Load #1 - NBT40/45 without extension 40127 •...

  • Page 208: Counterweight

    CRANE INSTALLATION NBT40 SERVICE MANUAL Over the rear: • Assemble the second stability test load as FIGURE 9-19 described above near the crane • Measure the load radius from the center of rotation directly to the rear of the machine. •...

  • Page 209: Counterweight Installation

    NBT40 SERVICE MANUAL CRANE INSTALLATION Counterweight Installation Install two lifting bolts into the 1.25 x 7 UNC lift inserts (2, Figure 9-19). Using a proper lifting device attach straps Position the crane on a firm level surface. Fully extend to each bolt, lift and place the counterweight inside the and set the outriggers crane support weldment.

  • Page 210: Specifications

    CRANE INSTALLATION NBT40 SERVICE MANUAL SPECIFICATIONS Hydraulic Hydraulic Pump ..............75.5 (286 1/min) at 2200 rpm, Variable displacement, axial piston with load sense Displacement ..............8.54 in /rev (140 cc/rev) Pressure Rating (rated)..........4600 psi (320 bar) Pressure Rating (peak ..........5075 psi (350 bar) Case Refill Capacity ............
  • Page 211 NBT40 SERVICE MANUAL CRANE INSTALLATION Line Speed (no load at high engine idle speed) Layer Low Speed m/sec (ft/sec) High Speed m/sec (ft/sec) 43.9 (144) 87.5 (287) 48.5 (159) 97.2 (319) 53.3 (175) 107.0 (351) 58.2 (191) 116.7 (383) 63.1 (207) 126.5 (415) National Crane 9-33...

  • Page 212: Counterweight

    CRANE INSTALLATION NBT40 SERVICE MANUAL Crane Operating Speeds (Performance based on full governed RPM and 37.8° C (100° F) hydraulic reservoir temperature.) Rotation 360°................. 30 ± 7 sec (1.8 ± 0.2 rpm) Adjustment Knob Closed Boom up -10° to 80° .............. 34 ± 5 sec Boom Down 80°...
  • Page 213 NBT40 SERVICE MANUAL CRANE INSTALLATION DIMENSIONAL DRAWING 7488-5 7488-3 FIGURE 9-21 National Crane 9-35 Published 8-01-2017 Control # 287-11...
  • Page 214 CRANE INSTALLATION NBT40 SERVICE MANUAL 7488-4 7488-6 9-36 Published 8-01-2017 Control # 287-11...
  • Page 215 NBT40 SERVICE MANUAL SCHEMATICS SECTION 10 SCHEMATICS For your convenience, the latest version of schematics available at the time of printing are placed in this section. National Crane 10-1...
  • Page 216 SCHEMATICS NBT40 SERVICE MANUAL THIS PAGE BLANK 10-2...
  • Page 217 NBT40 SERVICE MANUAL Alphabetical Index Bearing Clearance ........... . . 6-11 Bearing Replacement .
  • Page 218 NBT40 SERVICE MANUAL THIS PAGE BLANK APL-2...

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