Discount Equipment MAYCO ST-70 Parts And Operation Manual
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Discount Equipment MAYCO ST-70 Parts And Operation Manual

Structural concrete pump
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PARTS AND OPERATION MANUAL
MODEL ST-70
Structural Concrete Pump
(Hatz Diesel Engine)
Revision #4 (05/29/07)
THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES.

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  • Page 1 PARTS AND OPERATION MANUAL MODEL ST-70 Structural Concrete Pump (Hatz Diesel Engine) Revision #4 (05/29/07) THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES.
  • Page 2 Discount-Equipment.com is your online resource for quality parts & equipment. Florida: 561-964-4949 Outside Florida TOLL FREE: 877-690-3101 Need parts? Click on this link: http://www.discount-equipment.com/category/5443-parts/ choose one of the options to help get the right parts and equipment you are looking for.
  • Page 3 Diesel engine exhaust and some of PAGE 2 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

  • Page 4: Table Of Contents

    TABLE OF CONTENTS Here's How To Get Help .......... 3 Service Information Table Of Contents ........... 4 Wiring Schematic: Parts Ordering Procedures ........5 1) Interior Control Panel (Inside Door) ....74 2) Schematic Electrical Control Box ....75-76 3) Interconnect Electrical Control Box ....77 Hydraulic Diagram ...........

  • Page 5: Specifications

    ST-70 SPECIFICATIONS PERFORMANCE U.S. METRIC Pumping Rate — Volume Output 70 yd/hr.* (54m/hr)* Maximum Aggregate Size 1 1/2" minus (38 mm) Verticle Pumping Height ..........300 ft.* ..............(91m)* Horizontal Pumping Distance ......... 1200 ft.*..............(366m)* Engine — Diesel ............. HATZ 4M40L: 80HP(59.68KW) Hopper Capacity 10 cu.

  • Page 6: Pump Warranty

    MAYCO PUMP WARRANTY Mechanical Drive Models Hydraulic Drive Models MAYCO PUMP, hereinafter referred to as “Manufacturer’, MAYCO PUMP, hereinafter referred to as “Manufacturer”, warrants each new Mayco Pump sold by the manufacturer to warrants each new Mayco Pump sold by the manufacturer to be free from defects in material and workmanship, under be free from defects in material and workmanship, under normal use and service, for a period of one year after the date...

  • Page 7: Safety Instructions

    ST-70 — SAFETY INSTRUCTIONS READ THIS PARTS AND OPERATION MANUAL TRAVEL AND TRANSPORTATION THOROUGHLY BEFORE USING THIS MACHINE. It describes The machine must not be moved with extended outriggers. the safe, proper and most efficient way to operate it. KNOW Before traveling, check the transportation safety devices of YOUR MACHINE! the outriggers, the tire pressure and the functioning of the...
  • Page 8 ST-70 — SAFETY INSTRUCTIONS STABILIZER JACK PIPELINES PIPELINES AND CLAMPS MUST BE OF SUFFICIENT SIZE Prior to jacking check the soil conditions. If necessary, enlarge FOR THE PUMP’S CAPACITY. the support foot area by placing square timbers underneath. The pipeline connections must not be opened under working Keep a sufficient distance from excavations;...
  • Page 9 ST-70 — SAFETY INSTRUCTIONS O. Never fill the fuel tank while the engine is running or hot. MODEL ST-70 Avoid the possibility of spilled fuel which may cause a fire. P . Always carry a fire extinguisher of adequate size and a THE OPERATOR IS IN COMPLETE CHARGE OF THE PUMP first aid kit.

  • Page 10: Important Hand Signals

    IMPORTANT HAND SIGNALS ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 11...

  • Page 11: General Information

    ST-70 — GENERAL INFORMATION The principle of concrete pumping is based on self-lubrication. CONCRETE MIX DESIGN As it moves through the transfer line, the concrete takes the shape of a plastic cylinder. It is forced through the transfer line Mix design is most important to achieve maximum pumpability. on a film of mortar that is self-troweled to the service of the Pumpability is affected by, among other factors, the type and transfer line around its full periphery by the slug of concrete...
  • Page 12 ST-70 — GENERAL INFORMATION REGIONAL DIFFERENCES In addition, the Mayco Structural Concrete ST-70 Pump can be used to pump a large aggregate hard rock as follows: 1. Pea rock (1/2" minus) pump with mixes being as low as Concrete is made by mixing locally available rock and sand 30% rock and 70% sand.

  • Page 13: Concrete Mix Information

    ST-70 — CONCRETE MIX INFORMATION Job Identification* _______________________________________ Date* ______________________________________ Architect* ______________________________________________ General Contractor* ___________________________ Structural Engineer* ______________________________________ Concrete by* ________________________________ THE PROPORTIONS SHOWN HERE ARE A RECOMMENDATION BASED ON TESTS OF SAMPLES RECEIVED BY THE LABORATORY. TESTS PERFORMED BY SUPPLIERS OR MANUFACTURERS OR ON PRIOR KNOWLEDGE OF THE MATERIALS INVOLVED AND IS LIMITED TO INFORMATION DERIVED FROM THESE SAMPLES TESTS BY OTHERS OR TO THAT PRIOR KNOWLEDGE.
  • Page 14 ST-70 — CONCRETE MIX INFORMATION Job Identification* _______________________________________ Date* ______________________________________ Architect* ______________________________________________ General Contractor* ___________________________ Structural Engineer* _____________________________________ Concrete by* ________________________________ THE PROPORTIONS SHOWN HERE ARE A RECOMMENDATION BASED ON TESTS OF SAMPLES RECEIVED BY THE LABORATORY. TESTS PERFORMED BY SUPPLIERS OR MANUFACTURERS OR ON PRIOR KNOWLEDGE OF THE MATERIALS INVOLVED AND IS LIMITED TO INFORMATION DERIVED FROM THESE SAMPLES TESTS BY OTHERS OR TO THAT PRIOR KNOWLEDGE.
  • Page 15 ST-70 — CONCRETE MIX INFORMATION Job Identification* _______________________________________ Date* ______________________________________ Architect* ______________________________________________ General Contractor* ___________________________ Structural Engineer* _____________________________________ Concrete by* ________________________________ THE PROPORTIONS SHOWN HERE ARE A RECOMMENDATION BASED ON TESTS OF SAMPLES RECEIVED BY THE LABORATORY. TESTS PERFORMED BY SUPPLIERS OR MANUFACTURERS OR ON PRIOR KNOWLEDGE OF THE MATERIALS INVOLVED AND IS LIMITED TO INFORMATION DERIVED FROM THESE SAMPLES TESTS BY OTHERS OR TO THAT PRIOR KNOWLEDGE.
  • Page 16 ST-70 — CONCRETE MIX INFORMATION — s u l The sand content of pumpable concrete is very important. It is one of the two major ingredients that change due to regional location (the other is the rock or gravel). Above is a typical sieve analysis of washed concrete sand (W.C.S.) to A.S.T.M.

  • Page 17: Slump Test Procedure

    SLUMP TEST PROCEDURE 1. To obtain a representative sample, take samples at three or more regular intervals throughout the discharge of the mixer or truck. DO NOT take samples at the beginning or end of the discharge. 2. Dampen the inside of the cone and place it on a smooth, moist, nonabsorbent, level surface large enough to accommodate both the slumped concrete and the slump cone.

  • Page 18: Operation (How It Works)

    ST-70 — OPERATION (How it Works) The following is a brief explanation of how the concrete cylinders, hydraulic cylinders, shuttle tube, valves and hopper work in sequence to pump HIGH PRESSURE TO TANK TO TANK OIL FROM PUMP concrete. PROXIMITY SWITCH The hydraulic pressure is generated by variable...

  • Page 19: Initial Start-Up Procedure

    This section is intended to assist the operator with the initial Figure 1 illustrates the basic operating controls and indicators start-up of the MAYCO ST-70 Concrete Pump. It is extremely on the MAYCO ST-70 Concrete pump. Each of the items important that this section be read carefully before attempting referenced will be discussed.
  • Page 20 INITIAL START-UP PROCEDURE Engine Oil If the hydraulic oil level is low, remove the cap just above the oil level sight glass and add the correct amount of 1. Pull the engine oil dipstick from the engine side panel as hydraulic oil to bring the hydraulic oil level to a normal shown in Figure 2.
  • Page 21 INITIAL START-UP PROCEDURE D. Insert the cotter pin into handle tee bolt eye to lock the 7. Observe that the Air Filter and Oil Pressure status indicator stabilizer stand. lights are ON (Figure 9). The Battery status indicator light should be OFF Emergency Stop Switch A.
  • Page 22 INITIAL START-UP PROCEDURE 9. Turn the Volume Control (Figure 11), lock nut counterclockwise (CCW) to release the volume control knob. RPM X 100 VOLUME CONTROL TACH LOCK NUT HOURS Figure 13. VOLUME CONTROL Engine Tachometer INCREASE DECREASE TURN CLOCKWISE TO Figure 11.
  • Page 23 INITIAL START-UP PROCEDURE A. While monitoring the tachometer, (Figure 13) turn the Turn the Fan switch to the OFF position and listen for fan to engine Throttle Control (Figure 14) clockwise until the stop. If machine exceeds 170°F, and to cool the machine down, engine speed reaches 2550 RPM (maximum speed).
  • Page 24 Important Notice! During freezing temperature after pumping, completely drain the water box and cover the hopper. Frozen The MAYCO ST-70 Concrete Pump has a remote control feature liquid will restrict the piston travel and cause severe damage to that allows the pump to be remotely controlled. If desired, the the pump.

  • Page 25: Operating Procedures

    ST-70 — OPERATING PROCEDURES 14. Vertical and down-hill pumping are more difficult than Important Rules for the Setup and Operation of horizontal pumping. Vertical pumping requires higher Mayco Model ST-70 Hydraulic Concrete Pump pumping pressure. Down-hill pumping can cause separation of the concrete, which can cause a blockage. Back pressure must be kept in the line at all times during 1.
  • Page 26 ST-70 — OPERATING PROCEDURES Priming the Pump and Delivery System with Slurry. Waiting for concrete trucks to arrive: If there are delays: It is CRITICAL to the successful operation of a concrete 19.1 Stop the pump with a full hopper. pump that the manifold and all delivery hose, pipe and 19.2 Run the remixer, alternating forward and reverse, elbows are coated with a film of lubrication BEFORE...
  • Page 27 ST-70 — OPERATING PROCEDURES 7. The shuttle tube is plugged if volume at the discharge end 3. Damaged hoses with internal restrictions can cause blockages. of the hose stops, the hose is soft and the hydraulic oil pressure gauge reads 3000 psi or more. 4.
  • Page 28 ST-70 — OPERATING PROCEDURES Chip the blockage out with the pry-bar. 10. If the volume at end of hose starts to decrease gradually and eventually almost stops, it is quite likely that the wear Flush the shuttle tube with water. ring and/or wear plate have to be replaced due to Replace and seal the inspection cover plate on the shuttle excessive wear allowing the concrete to be discharged...
  • Page 29 ST-70 — OPERATING PROCEDURES 14. All new pumps are ‘water pressure tested” at the factory 7. Fill hopper with water. Pump until sponge and clean water This procedure permits a thorough inspection of entire come out the discharge end of the hose and line system. drive system and valving under simulated full load 8.

  • Page 30: Towing Information

    ST-70 — TOWING INFORMATION 1. Position actuator ball socket above 2" ball. 5. To make sure that the actuator is securely latched onto the ball, extend the trailer tongue jack to the ground and lift the WARNING: Use jack stand to lift tongue. Do NOT lift by truck and trailer combination 2"...
  • Page 31 ST-70 — TOWING INFORMATION 10. Retract the jack fully. Remove and store the caster, if BACKING UP applicable. 1. Refer to the previous steps 1 through 14 for Towing. 11. Check for proper truck-trailer hook-up; the tow vehicle and 2. Before backing up a slope or through soft ground, pull the trailer should be level with a positive tongue load.
  • Page 32 ST-70 — TOWING INFORMATION 5. If the pump is to be uncoupled from the tow vehicle after Extended Storage Instructions backing with the lever knob engaged, block all pump wheels The following preventative maintenance is recommended for and pull forward slightly to take strain off of the actuator. extended periods of storage.

  • Page 33: Explanation Of Codes In Remarks Column

    EXPLANATION OF CODE IN REMARKS COLUMN The following section explains the different symbols and remarks QTY. Column used in the Parts section of this manual. Use the help numbers Numbers Used - Item quantity can be indicated by a number, found on the back page of the manual if there are any questions.

  • Page 34: Suggested Spare Parts

    ST-70 — SUGGESTED SPARE PARTS ST-70 Structural Concrete Pump ST-70 Structural Concrete Pump 3 Units 1 Units Qty. Description Qty. Description 1 ..EM16459 ....PIN 1 ..EM16462 ....FELT HOLDER 2 ..EM25801 ....CONCRETE CYLINDER 4 ..EM16463 ....PISTON CUP 2 ..
  • Page 35 ST-70 — DECALS The safety instruction decals shown must be on all Mayco ST70 — Concrete Pump A MANUAL MUST BE STORED IN THIS TUBE AT ALL TIMES. ATTENTION CAUTION BEFORE SET-UP AND OPERATION OF THIS EQUIPMENT THE DESIGNATED OPERATOR MUST READ AND COMPLETELY UNDERSTAND THE OPERATING AND INSTRUCTION MANUAL INSIDE THIS TUBE.
  • Page 36 ST-70 — DECALS ST- 70 DECALS PART NO. PART NAME QTY. REMARKS EM935 DECAL, ATTENTION, MANUAL STORAGE EM969 DECAL, CAUTION TOWING EM7072 DECAL, CAUTION OPERATING INSTRUCTIONS EM97084 DECAL, MAINTENANCE EM955 DECAL, CAUTION DRY NITROGEN EM97083 DECAL, WARNING EM97071 DECAL, CAUTION MINIMUM OIL LEVEL EM1028 DECAL, MAYCO LOGO EM97082...

  • Page 37: Control Panel Installation

    ST-70 — CONTROL PANEL INSTALLATION PAGE 38 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 38 ST-70 — CONTROL PANEL INSTALLATION ST- 70 CONTROL PANEL INTALLATION PART NO. PART NAME QTY. REMARKS EM97073 PANEL, CONTROL ASSY EM492661 NUT, 1/4"-NC HEX. EM492622 WASHER, 1/4" LOCK EM492357 BOLT, 1/4"-NC x 1" HEX. EM491873 CONNECTOR EM5015901 CONNECTOR EM491876 WASHER, CONNECTOR EM509738 CABLE 18 GA.

  • Page 39: Control Panel Front

    ST-70 — CONTROL PANEL FRONT PAGE 40 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 40 ST-70 — CONTROL PANEL FRONT ST- 70 CONTROL PANEL FRONT PART NO. PART NAME QTY. REMARKS EM97073 CONTROL PANEL ASSY 1 .... (INCLS. SWITCHES AND INTERIOR ITEMS AS SHOWN ON PAGES 32 & 33). EM25704 TACHOMETER EM97063 SWITCH, EMERGENCY STOP EM97064 NAME PLATE, EMERGENCY STOP EM97062...

  • Page 41: Control Panel Interior

    ST-70 — CONTROL PANEL INTERIOR PAGE 42 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 42 ST-70 — CONTROL PANEL INTERIOR EXPLODED VIEW OF TERMINAL BLOCK (page 42) ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 43...
  • Page 43 ST-70 — CONTROL PANEL INTERIOR ST- 70 CONTROL PANEL INTERIOR PART NO. PART NAME QTY. REMARKS EM97050 RELAY (IDEC) EM97048 RELAY EM97027 SOLENOID EM97078 FUSE, 15 AMP EM98001 DIODE, 6 AMP EM98002 DIODE, 1 AMP EM40711 SWITCH, ITL1-1 PAGE 44 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 44 NOTE PAGE ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 45...

  • Page 45: Main Drive Pumps

    ST-70 — MAIN DRIVE PUMPS PAGE 46 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 46 ST-70 — MAIN DRIVE PUMPS ST-45 MAIN DRIVE PUMPS PART NO. PART NAME QTY. REMARKS EM 97088 COUPLING ASSY, ENGINE EM 506611 SOCKET HD. M12 x 20 EM 25459 ELBOW 90 DEG. EM 509777 HOSE, CASE DRAIN LINE EM 509784 ELBOW 90 DEG.

  • Page 47: Manifold Control

    ST-70 — MANIFOLD CONTROL PAGE 48 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 48 ST-70 — MANIFOLD CONTROL ST-70 MANIFOLD CONTROL PART NO. PART NAME QTY. REMARKS EM97011 DIRECTIONAL CONTROL VALVE, HYDRAULIC CYLINDER EM97013 DIRECTIONAL CONTROL VALVE, SHUTTLE CYLINDER EM97002 PILOT VALVE EM509342 SOCKET HEAD, 3/8"-NC x 2-1/2" EM196 SOCKET HEAD, 1/4"-NC x 2-1/4" EM508804 SOCKET HEAD, 10-NC x 2"...

  • Page 49: Accumulator

    ST-70 — ACCUMULATOR PAGE 50 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 50 ST-70 — ACCUMULATOR ST-70 ACCUMULATOR PART NO. PART NAME QTY. REMARKS EM97015 ACCUMULATOR EM97016 CLAMP EM509425 ADAPTER EM509353 ELBOW 90 DEG. EM509562 BOLT, HEX. HD 3/8"-NC x 5/8" EM492624 WASHER, LOCK 3/8"-NC EM492598 WASHER, 3/8" EM509444 BRACKET EM492373 BOLT, HEX. HD 3/8"-NC x 3/4" EM98099 ACCUMULATOR REPAIR KIT NOT ILLUSTRATED...
  • Page 51 Discount-Equipment.com is your online resource for quality parts & equipment. Florida: 561-964-4949 Outside Florida TOLL FREE: 877-690-3101 Need parts? Click on this link: http://www.discount-equipment.com/category/5443-parts/ choose one of the options to help get the right parts and equipment you are looking for.

  • Page 52: Hydraulic/Concrete Cylinders

    ST-70 — HYDRAULIC/CONCRETE CYLINDERS PAGE 52 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 53 ST-70 — HYDRAULIC/CONCRETE CYLINDERS ST-70 HYDRAULIC / CONCRETE CYLINDERS PART NO. PART NAME QTY. REMARKS EM510265 BOLT, HEX. HD. 3/8"-NC x 3 1/4" EM16464 PLATE, FACE EM16465 SPACER EM16463 PISTON CUP EM14408 RING, BRONCE EM16493 RING, FELT EM16462 FELT HOLDER EM16461 PLATE, OILER EM14407...

  • Page 54: Shuttle Tube Assy

    ST-70 — SHUTTLE TUBE ASSY PAGE 54 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 55 ST-70 — SHUTTLE TUBE ASSY ST-70 SHUTTLE TUBE ASSY PART NO. PART NAME QTY. REMARKS EM417 NUT, LOCK 1"-14 NS EM509221 NUT, HEX1"-14 NS EM16814 TENSIONER EM25236 AXLE, CRANK EM16169 WASHER, THRUST EM16145 BUSHING, BRONZE EM492397 BOLT, HEX 1/2"-NC x 2-1/2" EM25454 CYLINDER, SHUTTLE EM210...

  • Page 56: Hopper Assy

    ST-70 — HOPPER ASSY PAGE 56 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 57 ST-70 — HOPPER ASSY ST-70 HOPPER ASSY PART NO. PART NAME QTY. REMARKS EM25301 SHAFT DRIVE END EM25863 REMIXER EM492375 BOLT, HEX HD 3/8"-NC x 1" EM492624 WASHER, LOCK 3/8" EM23305 SHAFT, DRIVE END EM491686 COTTER PIN 1/8" x 1-3/4" EM16159 PIN, HINGE EM505723...

  • Page 58: Remixer Control Assy

    ST-70 — REMIXER CONTROL ASSY PAGE 58 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 59 ST-70 — REMIXER CONTROL ASSY ST-70 REMIXER CONTROL ASSY PART NO. PART NAME QTY. REMARKS EM25425 MOTOR, REMIXER EM25508 ELBOW, 45 DEG. EM25483 HOSE, MOTOR TO VALVE EM25509 ADAPTER EM509378 HOSE, RETURN TO HEAT EXCHANGER EM25507 ELBOW, 90 DEG. EM25495 VALVE, REMIXER EM492553 NUT, HEX.

  • Page 60: Throttle Assy

    ST-70 — THROTTLE ASSY PAGE 60 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 61 ST-70 — THROTTLE ASSY ST-70 THROTTLE ASSY PART NO. PART NAME QTY. REMARKS EM20709-1 SOLENOID EM400 NUT, HEX. 1/4"-NF EM26315 ADAPTER EM492357 BOLT, HEX. HD. 1/4"-NC x 1" EM959119 CLEVIS EM722 STOP NUT EM492598 NUT, LOCK 5/16"-NC EM492364 BOLT, HEX. HD. 5/16"-NC x 1" EM16740-2 CABLE, THROTTLE EM16740-1...

  • Page 62: Engine And Frame

    ST-70 — ENGINE AND FRAME PAGE 62 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 63 ST-70 — ENGINE AND FRAME ST-70 ENGINE AND FRAME PART NO. PART NAME QTY. REMARKS EM25454 CYLINDER, SHUTTLE EM25459 ELBOW, 3/4" x 90° EM25500 ELBOW, 3/4" x 45° EM132 BOLT, HEX HD, 1/2-13 x 2" EM621 WILLIAM WASHER, 1/2" EM606 WASHER, LOCK, 1/2"...

  • Page 64: Oil Cooler Assy

    ST-70 — OIL COOLER ASSY PAGE 64 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 65 ST-70 — OIL COOLER ASSY ST-70 OIL COOLER ASSY PART NO. PART NAME QTY. REMARKS EM509805 GUARD, COOLER EM492364 BOLT, HEX. HD. 5/16"-NC x 1" EM923023 WASHER, 5/16" EM509791 COOLER EM509779 HOSE EM509802 SHROUD, COOLER EM492622 WASHER, LOCK 1/4" EM492356 BOLT, HEX.

  • Page 66: Fuel And Hydraulic Tank

    ST-70 — FUEL AND HYDRAULIC TANK PAGE 66 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 67 ST-70 — FUEL AND HYDRAULIC TANK ST-70 FUEL AND HYDRAULIC TANK PART NO. PART NAME QTY. REMARKS EM509406 TANK, FUEL & HYDRAULIC EM175 BOLT, HEX 3/8"-NC x 1 1/4" EM492598 WASHER 3/8" EM492583 NUT, LOCK 3/8" EM18436 ELBOW EM16517 REDUCER EM50424 STRAINER EM16433...

  • Page 68: Battery,Tail Lights,Water Separator,Gauges

    ST-70 — BATTERY, TAIL LIGHTS, WATER SEPARATOR, GAUGES PAGE 68 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 69 ST-70 — BATTERY, TAIL LIGHTS, WATER SEPARATOR, GAUGES ST-70 BATTERY, TAIL LIGHTS, WATER SEPARATOR, GAUGES PART NO. PART NAME QTY. REMARKS EM26536 LIGHT, TAIL EM26536-1 BRACKET, TAIL LIGHT EM492364 BOLT, HEX. 5/16"-NC x 1" EM492623 WASHER, LOCK 5/16" EM492553 NUT, HEX. 5/16"-NC EM492561 NUT, HEX.1/4"-NC EM492622...

  • Page 70: Axle And Brakes

    ST-70 — AXLE AND BRAKES PAGE 70 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 71 ST-70 — AXLE AND BRAKES ST-70 AXLE AND BRAKES PART NO. PART NAME QTY. REMARKS EM26519 NUT, CHROME EM26615 TIRE AND WHEEL EM26520 CAP, HUB EM491690 PIN, COTTER 5/32" x 2" EM16610 DRUM, BRAKE EM26601 CAP, GREASE EM26113 NUT, CASTLE EM26111 RACE, OUTER BEARING EM26112...
  • Page 72 ST-70 — HYDRAULIC SURGE BRAKE AND HITCH PAGE 72 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 73 ST-70 — HYDRAULIC SURGE BRAKE AND HITCH ST-70 HYDRAULIC SURGE BRAKE AND HITCH PART NO. PART NAME QTY. REMARKS EM492584 NUT 1/2"-NC HEX. EM492626 WASHER, LOCK 1/2" EM16602 2" HYDRAULIC SURGE BRAKE ASSY 1 ....FOR COMPONENTS: CONTACT YOUR LOCAL ATWOOD DEALER. EM492401 BOLT, HEX.
  • Page 74 VICE VICE SER VICE VICE VICE INFORMA INFORMA TION TION INFORMA TION TION INFORMA INFORMA TION PAGE 74 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

  • Page 75: Interior Control Panel (Inside Door)

    ST-70 — INTERIOR CONTROL PANEL (Inside Door) NOTE: ADDITIONAL ILLUSTRATIONS PAGE 42, 43 4 30 PB-1 SW-1 SW-4 SW-2 SW-3 SW-6 SW-5 TO TB1 AND TB2 ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 75...

  • Page 76: Schematic Electrical Control Box

    ST-70 — SCHEMATIC ELECTRICAL CONTROL BOX PAGE 76 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 77 ST-70 — SCHEMATIC ELECTRICAL CONTROL BOX ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 77...
  • Page 78 ST-70 — INTERCONNECT HYDRAULIC CONTROL BOX PAGE 78 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)

  • Page 79: Hydraulic Diagram

    ST-70 — HYDRAULIC DIAGRAM ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07) — PAGE 79...

  • Page 80: Optional Radio Control

    ST-70 — OPTIONAL RADIO CONTROL PAGE 80 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
  • Page 81 ST-70 — SERVICE INFORMATION The service procedures contained in this manual are intended for use by an individual equipped with the proper tools and equipment and familiar with safe shop practices. Should questions arise during the service or repair . . . stop . . . and contact Mayco service department.

  • Page 82: Maintenance Check Schedule

    ST-70 — SERVICE INFORMATION Maintenance check schedule l i o r i a l i f r e t l i f r e t c i l l l i c i r i t a c i l l i o c i l e t l...
  • Page 83 ST-70 — SERVICE INFORMATION Lubrication: Grease daily/Hour ■ Main hydraulic cylinders - 2 Place ■ Remix bearings - 2 Place ■ Axle crank - 1 Place ■ Suttle cylinders - 2 Place ■ “S” tube outlet flange - 3 Place Grease Type: Lithium Based EP Texaco Multitak 20...

  • Page 84: Pressure Setting Sequence

    ST-70 — SERVICE INFORMATION ST70 Pressure Setting Sequence (Setting maximum pump pressure) Step 1: Remove acorn nut from pressure compensator (located on the top front of the Rexroth pump. The compensator is the lower of the two valves) loosen the jam nut and turn the allen screw clockwise until it seats.

  • Page 85: Accumulator Circuit

    ST-70 — SERVICE INFORMATION ST-70 Accumulator Circuit Checking accumulator bladder pressure The accumulator charge pressure should read 1100 PSI. To The accumulator circuit has two functions in the hydraulic check pressure, start engine and stroke the pump. The system. accumulator pressure gauge should read 1750 PSI. To determine the actual accumulator PSI, stop engine and observe The accumulator circuit furnishes the hydraulic pressure the pressure gauge.

  • Page 86: Hydraulic System Troubleshooting

    ST-70 — SERVICE INFORMATION Hydraulic system trouble shooting Problem Accumulator pressure drops to zero on every cycle Problem i t u r t i r o t h t i r t i No hydraulic oil flow from axial piston pump. .

  • Page 87: Electrical System

    ST-70 — SERVICE INFORMATION Electrical System Electrical Problem Proximity switches When starter switch is activated and nothing occurs. The proximity is a normally open switch. The proximity develops i t u a radio frequency, which is emitted from the face of the proximity y t l o r t , l e...

  • Page 88: Changing Concrete Cylinder Piston Cups

    ST-70 — SERVICE INFORMATION Changing the concrete cylinder piston cups Step 5: Start engine and turn on pressure test switch, cycle pump in reverse until hydraulic system obtains maximum pressure, at this point turn pump and engine The Rubber piston cups will occasionally require replacement off.

  • Page 89: Changing The Wear Plate And Ring

    ST-70 — SERVICE INFORMATION Changing the wear plate and ring Step 6: Clean out all concrete build up in and around the nun- plate area with a wire brush. Due to the swinging motion of the Nun-plate and the abrasive nature of concrete it is normal for the cutting ring to wear on the Step 7: Inspect the wear components for indications of wear.

  • Page 90: Wheel Bearings

    ST-70 — SERVICE INFORMATION Wheel Bearings Problem Brake overheating, side pull, brakes do not operate, poor brake After every 6 months of operation inspect the wheel bearings. performance. Once a year, or when required, disassemble the wheel hubs i t u remove the old grease and repack the bearings forcing grease i k a i l y...
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