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NACD 1019024AM Service Manual

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NACD Power Take-Off Service Manual
1019024AM
14" HD, 14" HD(DP) and 14" HD(TP) Clutches
Includes Installation, Operation, Maintenance and Overhaul Instructions

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  • Page 1 NACD Power Take-Off Service Manual 1019024AM 14” HD, 14” HD(DP) and 14” HD(TP) Clutches Includes Installation, Operation, Maintenance and Overhaul Instructions...
  • Page 3 Phone: (800) 383-9204 (815) 282-7960 North American Clutch & Driveline (815) 282-9160 Rockford, Illinois www.naclutch.com...
  • Page 4 NACD. WARRANTY: NACD’s limited Warranty is described in detail in this publication. It is the responsibility of the original pur- chaser or manufacturer, successive buyers, users, third parties or employees to make themselves aware of this warranty and all conditions it contains.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS 1.0 INTRODUCTION 1.1 Part Numbering System 1.2 Locating The Part Number And Serial Number 2.0 GENERAL INFORMATION, SPECIFICATIONS & RECOMMENDATIONS 2.1 Basic Dimensions for SAE Housings 2.2 Basic Dimensions for SAE Flywheels 2.3 Application Guidelines 2.4 Allowable Side Load Pulls 2.5 Maximum Safe Operating Speeds 2.6 Required Clutch Torque Capacity 2.7 Alignment Tolerances For Flywheels &...
  • Page 6 TABLE OF CONTENTS 6.0 EXPLODED VIEWS - TYPICAL POWER TAKE-OFFS 6.1 PTO Exploded Views (exclude clutch) 6.2 Clutch Assembly Exploded View 7.0 DISASSEMBLE THE POWER TAKE-OFF 7.1 Remove accessories attached to the PTO 7.2 Remove the PTO from the engine 7.3 Remove the clutch from the shaft 7.4 Separate the bearing housing from the bell housing 7.5 Remove the shaft and bearings from the bearing housing...

  • Page 7: Introduction

    PTO operation 1.1 Part Numbering System NACD Power Take-Off part numbers have changed in the way they were displayed in print over the years, primarily due to advances in technology. The part number format for an NACD Power Take-Off is 4XXXXXAM, where XXXXX is a 5 digit alpha number unique to that particular assembly.

  • Page 8: General Information, Specifications & Recommendations

    2.0 GENERAL INFORMATION, SPECIFICATIONS & RECOMMENDATIONS 2.1 Basic Dimensions for SAE Housings All dimensions are in inches unless otherwise specified. “D”= Depth of pilot bore from housing face to shoulder on flywheel or to crankshaft flange face. Pilot O.D. Bolt Circle (See Side Flywheel Housing Bolts Diameter...

  • Page 9: Application Guidelines

    (9)(see illustration in section 6.1) are not approved for in-line drive applications. 2.3b Application Guidelines Segmented facings in 2-plate (DP) and 3-plate (TP) Clutches - NACD does not approve the use of segmented facings in 2-plate (DP) and 3-plate (TP) clutches. 2.4 Allowable Side Load Pulls The following formula can be used to estimate applied side loads.

  • Page 10: Maximum Safe Operating Speeds

    2.5 Maximum Safe Operating Speeds Maximum safe operating speed is 2200 rpm for NACD Power Take-Offs with 14” HD, 14” HD (DP) or 14” HD (TP) clutches used for either in-line or side load drives. 2.6 Required Clutch Torque Capacity To determine the actual torque capacity required of a clutch used for any given application the maximum engine torque and torque service factor must be considered.
  • Page 11 2.7.1 Flywheel Housing Face Runout Deviation Check Mount the indicator base on the face of the flywheel and position the dial indicator tip perpendicular to the flywheel housing mounting flange face. Rotate the flywheel through 360 degrees. Note: The flywheel and crankshaft of the engine must be held against either the front or rear of the crankshaft thrust bearing while the total indicator sweep (TIR) measurement is being made.

  • Page 12: Maintenance

    For ambient temperatures above 100° F. (37.8°C.), contact NACD for specifications. Grease caution: Do not mix sodium or calcium based greases with lithium grease. Do not mix different types of greases under any circumstances in NACD Power Take-Offs. Do not use molybdenum disulfade grease.
  • Page 13 3.2.1 Bronze & Greasable Ball Type Release Bearing Using a hand operated grease gun, add 1 or 2 pumps of grease per 8-10 hrs. of operation (or add grease until grease begins to weep from the I.D. of the bearing and from between the release sleeve and the shaft).

  • Page 14: Bearing Operating Temperature

    3.3 Bearing Operating Temperature 3.3.1 Main Bearing Operating temperature range is normally between 170°F. and 200°F. (76.7°C. to 93.3°C.). Locations with high ambient temperatures such as desert climates will cause the bearings to operate at a higher temperature. More frequent lubrication intervals and/or specialized grease designed for higher operating temperatures will be required.

  • Page 15: Torque Wrench Method (Preferred Method)

    The clutch should ENGAGE within the torque readings shown. An adapter, NACD Part Number 236484AM may be obtained to provide a 1 1/2” hex nut at the end of the cross shaft. The adapter may be used in place of the standard handle for the purpose of checking clutch adjustment with a torque wrench, or it may be installed on the end of the cross shaft opposite the standard handle.

  • Page 16: Altered Handle Length

    3.4.3 Spring scale method with altered or special handle length For other handle lengths, us the following formula and the values shown in the following chart. x = 1.15 x (A x Y) X Engagement force at attachment point lbs. force (newtons) Y Engagement force at clutch release bearing 425 lbs.

  • Page 17: Installation Information

    Do not disengage the clutch before installing the PTO on the engine. Disengagement allows the clutch plates to slip out of the correctly aligned positions established at NACD. 4.1.1 If the facing plates have become misaligned, they may be realigned by using the drive ring as a gauge.

  • Page 18: Flywheel And Flywheel Housing Alignment Checks

    4.1.3 Use the clutch drive ring provided with the PTO or remove the drive ring from the engine flywheel to use as an alignment gauge. Place the drive ring over the clutch facings with the clutch disengaged. Mesh the drive teeth of the facings with the drive ring and align the facings by centering the drive ring relative to the O.D.

  • Page 19: Install The Pto On The Engine

    shaft. Add grease until the center passage is filled with grease. Be sure that the shipping plug is removed from the pilot bearing end of the shaft. Cross Shaft: With a hand operated grease gun, add 1 or 2 shots of grease into each of the grease fittings located in the PTO housing, near each end of the cross shaft.

  • Page 20: Correct Handle Installation Position

    4.4.4 Install the PTO with the cross shaft in a horizontal position. Install two (2) 5” long guide bolts into the flywheel housing bolt holes, located approximately at the 3 o’ clock and 9 o’ clock positions. Position the PTO on the guide bolts to help align the unit and support the weight while the mounting bolts are installed.

  • Page 21: Check Clutch Engagement Pressure

    4.6 Check Clutch Engagement Pressure The clutch was properly adjusted at NACD. However, due to variables created by first- time engagements, the clutch engagement pressure should be rechecked to insure proper clutch engagement pressure at the time of installation. See sections 3.4 and 3.5.

  • Page 22: Outboard Bearing Shimming And Alignment

    4.7.5 Bolt the support plate to the PTO. Begin tightening the bolts which affix the support plate to the base. Read the dial indicators. Add shims until the indicators read 0+0.001 inches (0.0254 mm.), after the mounting bolts have been installed and properly torqued.
  • Page 23 & Clutch Size otherwise specified. Part numbers and specifications are subject to change 411074AM 1-14-3 without notice. 427493AM 1-14-3 The following is a partial listing of NACD 433853AM 1-14-3 PTO’s and recommended support plate configurations for each. 434764AM 1-14-3 435730AM 1-14-3 4.8.5 Secure (2) dial indicators to a solid...

  • Page 24: Operation

    4.8.7 Read the dial indicator. Add shims until the indicator reads 0+0.001 inches (0.0254 mm.) after installing and properly torquing the mounting bolts. 4.8.8 Tighten the belts using accurate tensioning methods and an accurate belt tensioning gage. The belts should not be tightened until all the mounting bolts have been tightened.

  • Page 25: Exploded Views - Typical Power Take-Offs

    6.0 EXPLODED VIEWS - TYPICAL POWER TAKE-OFFS 6.0.1 Typical bearing housing configuration B is illustrated NOTE: Item numbers shown are intended for reference only, and are not intended to be used as part numbers for ordering component parts. POWER TAKE-OFF ASSEMBLY COMPONENTS Item Item Name Qty.

  • Page 26: Pto Exploded Views (Exclude Clutch)

    6.1 PTO Exploded Views (exclude clutch) 6.1.2 Typical bearing housing configuration C is illustrated NOTE: Item numbers shown are intended for reference only, and are not intended to be used as part numbers for ordering component parts. POWER TAKE-OFF ASSEMBLY COMPONENTS Item Item Name Qty.

  • Page 27: Clutch Assembly Exploded View

    6.2 Clutch Assembly Exploded View (Exploded View - Typical 14” HD (DP) style clutch is illustrated) NOTE: Item numbers shown are intended for reference only, and are not intended to be used as part numbers for ordering component parts. CLUTCH ASSEMBLY COMPONENTS Item Item Name Qty.

  • Page 28: Disassemble The Power Take-Off

    7.0 DISASSEMBLE THE POWER TAKE-OFF Refer to parts illustrations in section 6.0 7.1 Remove all accessories or drives attached to the output shaft 7.1.1 Engage the clutch. 7.1.2 Disconnect any linkage which may be attached to the clutch actuating handle. 7.1.3 If the handle must be removed to permit removal of the power take-off from the engine, loosen the bolt (22) which fastens the handle to the cross-shaft.

  • Page 29: Remove The Clutch From The Shaft

    7.3 Remove the clutch from the PTO Shaft 7.3.1 Remove the pilot bearing (25) from the shaft using a split-plate bearing puller. 7.3.2 If not done in 7.1.2 thru 7.1.5, loosen bolt (22) and remove handle (21). 7.3.3 Remove jam nut (6) securing the grease hose (if the release bearing is a regreasable type and a grease hose is used) and disconnect the hose fitting from the bell housing.
  • Page 30 If installed too deep, legs can damage 3/4” – 10 threaded holes facings or center plate 7.3.7 Pull the clutch from the shaft. (It may be necessary to strike the end of the puller screw to “jar” the clutch loose. If so, use a suitable mallet to avoid damage or injury.) Remove the puller when the clutch has broken loose from the shaft.
  • Page 31 CONFIGURATION C Bell Housing (1) Bearing Housing (30) Drive Shaft (8) Main Bearing (9) External Snaprings (29) Internal Snaprings (68) Bolt (43) Lockwasher (44) CONFIGURATION D Lockwasher (13) Bell Housing (1) Lock Bolt (12) Main Bearing (9) Adjustment Lock (11) Bearing Retainer (10) Drive Shaft (8) External Snaprings (29)

  • Page 32: Separate The Bearing Housing From The Bell Housing

    7.4 Seperate the bearing housing from the bell housing. The illustrations on the previous page show standard bearing housing configurations found in NACD power take-offs. “Specials” have been designed and sold, but they are only slight variations of these standard configurations.

  • Page 33: Remove The Shaft And Bearings From The Bearing Housing

    Configurations B, D, and E: Proceed at (the bearing housing/bell housing is a 1 pc. design configuration. Configurations A, C, F, and G only: 7.4.1 Position the bell housing on blocks, under a hoist, with the drive shaft (8) in a vertical position, output end up.

  • Page 34: Remove The Main Bearings From The Shaft

    Configuration C only: 7.5.5 Remove internal snapring (68). 7.5.6 Lift the drive shaft (8) with bearing (9) from the bearing housing (a hoist may be needed). 7.6 Remove The Main Bearings From The Drive Shaft Wash the bearings and bearing cups with clean fuel oil or solvent. Dry and carefully examine for wear, corrosion or rough spots.

  • Page 35: Remove The Cross Shaft

    7.7 Remove the cross shaft. 7.7.1 Loosen (2) bolts (18) securing the yoke assembly (17) to the cross shaft. 7.7.2 Slide the cross shaft through the housing until the yoke rests against a block of wood placed between the yoke and the inside wall of the housing. 7.7.3 With a soft mallet, drive the cross shaft out of the yoke just far enough to expose two woodruff keys (15) Note: The yoke may be loose enough to slide out without use of a mallet.
  • Page 36 8.3.2 Threads for the bearing retainer should not be damaged. 8.3.3 If a bearing failure has occurred, be sure the bearing has not spun in the housing, destroying the shoulder or bore contacted by the bearing. Although the moveable bearing retainer will compensate for small amounts of shoulder wear, it is imperative the bearing contact the housing only at the O.D.
  • Page 37 8.4.4 Particular attention should be given to the pilot diameter and face where the bell housing and bearing housing adjoin. The mounting pilot O.D. and mounting face must be free of protruding metal, rust, corrosion etc., which would prevent the bearing housing from locating properly in the bell housing bore or against the bell housing face.

  • Page 38: Disassemble The Clutch

    Pilot Diameter New Minimum Dimension (Worn) 1.1822”-1.1816” 1.1816” (30.0126 mm.) 1.3781”-1.3766” 1.3766” (34.9656 mm.) 1.7718”-1.7713” 1.7713” (44.9910 mm.) 8.8.2 The shoulder between the tapered roller bearings (configurations A, B, and F) and the bearing shoulder (configuration E and G) must not be damaged, and must have straight sides.

  • Page 39: Remove The Release Sleeve And Bearing Sub-Assembly

    9.2 Remove the release sleeve and bearing assembly. Note: Sleeve used with bronze- type release bearing is shown. 9.2.1 Notice the direction clevis pin (414 and 416) are installed. Upon reassembly of the clutch they must be installed from the same side so the head leads the direction of clutch rotation.

  • Page 40: Remove The Adjusting Ring Sub Assembly

    9.3.3 Remove the external snapring (129) from the release sleeve. 9.3.4 Using a split plate located as close to the release sleeve as possible, support beneath the release bearing (127) and bearing carrier (126) on the bed of a press. Press the release sleeve from the bearing.

  • Page 41: Complete The Disassembly Of The Clutch

    9.4.2 Rotate the adjusting ring (113) counterclockwise to remove it from the clutch body Note: Do not disassemble the adjusting ring assembly. If the unit needs to be repaired, it must be serviced as an assembly. Individual components of the adjusting ring assembly are not sold separately.
  • Page 42 10.1.5 Threads must not be damaged. 10.2 Pressure Plate 10.2.1 Friction surface must not have heat cracks, must be smooth and must be flat within .005” (.127 mm.). 10.2.2 Splines must not have wear marks exceeding .003” (.076 mm.), depth due to wear from the pressure plate or center plate.
  • Page 43 10.3.6 (for bronze-type release bearing) Shoulder width should not be worn below .493" (12.522 mm.). 10.4 Release Bearing 10.4.1 Ball Type: Clean and lightly oil the bearing. Hold the inner race and slowly rotate the outter race, feeling and listening for rough spots, catches or a sticking condition. 10.4.2 Bronze Type: Flat areas are usually worn on the trunnions.

  • Page 44: Assemble The Clutch

    10.7 Center Plate 10.7.1 Friction surfaces must not have heat cracks, must be smooth, and must be flat within .005” (.127 mm.). 10.7.2 Internal teeth must not have wear marks exceeding .003” (.076 mm.) depth due to wear from the spines of the clutch body. 10.7.3 Minimum thickness of the facing contact area must not be less than .490”...
  • Page 45 11.1.2 Place the internal snapring (128) on top of the bearing before proceeding to 11.1.3. 11.1.3 Press the release sleeve (125) into the bearing until the shoulder of the release sleeve stops against the bearing inner race. 11.1.4 Install external snapring (129) in the groove of the release sleeve to hold the bearing on the release sleeve.

  • Page 46: Assemble The Clutch Body Sub-Assembly

    11.1.14 Install the clevis pin (414) through both links and the protruding boss as shown. Caution: NACD does Segmented-type Facing not approve the use of 11.1.15 Securely install the segmented type facings in 2-plate (DP) or 3-plate (TP) retainer (415) in the groove of clutches.

  • Page 47: Install The Release Levers

    11.2.1 Place the clutch body (109) on the bench with the friction surface up. 11.2.2 Place one facing plate (110) on the clutch body. 11.2.3 (14” HD (DP) and 14” HD (TP) clutches): Place one center plate (111), then a second facing plate on top of the center plate.

  • Page 48: Install The Release Sleeve And Bearing Assembly

    11.3.6 Install the adjusting ring assembly (113) on the threads of the clutch body, with a screwdriver, rotate the lock pin (402) to rotate the adjustment lock finger outward so it does not interfere with the teeth, and thread the adjusting ring until it is approximately even with the top of the clutch body.

  • Page 49: Assemble The Power Take-Off

    Note: If the facings are not perfectly aligned in the clutch, mounting the PTO onto the engine will be restricted by interference between the facing teeth and the teeth of the drive ring. See section 4.1 for facing alignment procedure. 11.4.6 With a screwdriver, rotate the lock pin (402) to rotate the adjustment lock finger into the teeth of the clutch body.
  • Page 50 12.1.3 Support beneath the steel ring on CONFIGURATIONS C AND D the bed of a press. Press the drive shaft External into the bearing until the shoulder on the Snaprings (29) shaft is tight against the wide face of the Bearing bearing inner race.

  • Page 51: Install The Drive Shaft In The Bearing Housing

    CONFIGURATION B 12.1.10 (Configuration G only): Start one bearing cone (9) on the pilot bearing end Bell Housing (1) of the drive shaft with the narrow face of Bearing Cups (9) Lockwasher (13) the inner race facing the shoulder of the Lock Bolt (12) shaft.

  • Page 52: Join The Bearing Housing And Bell Housing

    12.2.4 Place the second bearing cup onto the exposed bearing cone. (Gently tap on the outer edge of the cup to seat the cup against the bearing cone. Under no circumstances should abusive force be used. Excessive force can damage the roller surface of the bearing cup, causing bearing failure.) 12.2.5 Thread the bearing retainer (10) into the bearing housing until it is snugly tightened against the bearing cup.

  • Page 53: Install The Cross Shaft And Clutch Release Yoke

    12.3.2 Using the hoist, carefully lower the CONFIGURATION C shaft and bearing housing onto the bell Bearing housing. Position the threaded hole in Housing (30) the bearing housing flange (the hole is for grease fitting (7) in line with the inspection Internal opening in the bell housing.

  • Page 54: Complete The Assembly Of The Housing Unit

    12.4.5 Install (2) bolts and lockwashers (18 CONFIGURATION A and 19) in the clutch release yoke. Tighten and torque to 17-20 ft. lbs. (23-27 Nm.) 12.5 Complete the assembly of the housing unit Bearing Housing (30) 12.5.1 Install all pipe plugs and fittings to complete assembly of the bearing housing and Bolts (43) Bell...

  • Page 55: Install The Clutch On The Drive Shaft

    13.2.5 Raise the PTO off the wood block. Lightly tap on the drive shaft to move it downward against the rear bearing cup. 13.2.6 Again read the dial indicator. It should have returned to “0”. If it didn’t, repeat 13.2.3 thru 13.2.5 to obtain an accurate reading.
  • Page 56 14.7 Place the locking washer (27) on top of the clutch. Locate the tab in the keyway. 14.8 Install and tighten nut (26) against the locking washer. Torque to: 14” HD 225-230 ft.- lbs. (305-312 Nm.) 14” HD (DP) 225-230 ft.- lbs. (305-312 Nm.) 14”...

  • Page 57: Troubleshooting Guide

    14.12 Install the grease hose (greasable release bearing only) through the hole in the side of the housing. Install and tighten the lock nut (6). 14.13 Install the grease fitting (5) in the end of the grease hose (if used) 14.14 Lubricate the PTO.
  • Page 58 (See section 3.0) Clutch failure (several Clutch does not have torque Review application. Contact times) capacity for engine output. NACD. Failed release bearing Improper handle position Position handle vertically up (bronze type) and/or modification. or down when engaged and no pre-load.

  • Page 59: Warranty

    1. Complete parts or products upon request must be returned transportation prepaid and also the claims submitted to NACD within sixty (60) days after completion of the in-warranty repair. 2. The warranty is void if, in the opinion of NACD, the failure of the part or product resulted from abuse, neglect, improper mainte nance or accident.
  • Page 60 NOTICE NACD makes no warranty or guarantee of any kind, expressed, implied or otherwise, with regard to the information contained within this manual. NACD assumes no responsibility for any errors that may appear in this manual and shall not be liable under any circumstances for incidental, consequential or punitive damages in connection with, or arising out of, the use of this manual.
  • Page 62 North American Clutch & Driveline P.O. Box 15130 Rockford, IL. 61132 Phone: (800) 383-9204 Fax: (815) 282-9160 www.naclutch.com...

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