Parker HTG Series Service Procedure
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Parker HTG Series Service Procedure

Integrated hydrostatic transmission
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HY13-1524-002-M1/US
Parker HTG Series
Integrated Hydrostatic
Transmission
Effective:
HTG Series
Service Procedure
This product can expose you to chemicals including lead and DEHP, which are known
to the State of California to cause cancer, and birth defects or other reproductive harm.
For more information go to www.p65warnings.ca.gov
August, 2021

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  • Page 1 HY13-1524-002-M1/US Parker HTG Series Integrated Hydrostatic Transmission Effective: August, 2021 HTG Series Service Procedure This product can expose you to chemicals including lead and DEHP, which are known to the State of California to cause cancer, and birth defects or other reproductive harm.
  • Page 2 Offer of Sale The items described in this document are hereby offered for sale by Parker Hannifin Corporation, its subsidiaries or its authorized distributors. This offer and its acceptance are governed by the provisions stated in the “Offer of Sale”.

  • Page 3: Table Of Contents

    Offer of Sale ............................62-63 Disclaimer This Service Manual has been prepared by Parker Hannifin for reference and use by individuals who have been trained to repair and service hydraulic motors and systems on commercial and non-commercial equipment ap- plications. Parker Hannifin has exercised reasonable care and diligence to present accurate, clear and complete information and instructions regarding the techniques and tools required for maintaining, repairing and servic- ing the complete line of Parker Integrated Hydrostatic Transmission Units.

  • Page 4: Design Features

    HTG Series Integrated Hydrostatic Transmission Introduction The three-column format used in this Service Manual will help make it easy for you to service a HTG Series Integrated Hydrostatic Transmission. Column one illustrates the procedure, column two gives a brief key for each step, and column three explains in detail the procedure you should follow.

  • Page 5: Troubleshooting Guide

    Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Troubleshooting Guide NOTE Hydraulic Components Before troubleshooting any system problem, check If you think the problem is caused by a hydraulic service literature published by the equipment and/or component, start by checking the easy-to-reach items.
  • Page 6 Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Troubleshooting Checklist (page 1 of 3) General Cautions Caution: Do not pressure wash the transmission to remove debris. Use a power blower to remove built up debris. Caution: Use of Foam/ Liquid filled tires is not recommended. Filling the tires will void the transmission warranty.
  • Page 7 Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Troubleshooting Checklist (page 2 of 3) If In Warranty Replace Problem/ Symptom What to Check/ Look For/ Look At Potential Repair Fix Dealer Fix Transmission Low Power Excessive load Verify mower use conditions, reduce...
  • Page 8 Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Troubleshooting Checklist (page 3 of 3) If In Warranty Replace Problem/ Symptom What to Check/ Look For/ Look At Potential Repair Fix Dealer Fix Transmission Lack of control/jerky Proper tire pressure...

  • Page 9: Tools And Material Required For Servicing

    • To insure maximum HTG Transmission performance and life, use Parker-1000™ oil. HTG transmissions come factory filled with Parker HT-1000™ oil. Oil change intervals depend on the type of oil used. Follow OEM manufacturers recommended oil change interval. Always change the filter when changing the oil.

  • Page 10: System Maintenance Tips

    • Investigate and correct any external leak in the hydraulic system, no matter how minor the leak. • Comply with Parker specifications for cleaning or replacing the filter. CAUTION Do not weld, braze, solder or alter any HTG Transmission component.

  • Page 11: Bolt Torque

    Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission HTG Transmission Assembly Rebuild Bolt Torques Component ft-lbs in-lbs End Block to Housing 22.5-25 270-300 Charge Cover Bolts 7.5-9.5 90-110 Shock/ Check Valves 21-24 252-288 Motor Bolts 45-55 Oil Filter 9.6-11.3...

  • Page 12: Mower Diagram

    Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Top View of Mower (Some parts sectioned for clarity) Mower Frame Lorem ipsum Driver’s Seat Tire Tire Engine Transmissions Parker Hannifin Corporation Hydraulic Pump/Motor Division Greeneville, Tennessee USA...

  • Page 13: Exploded Assembly View

    Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Exploded Diagram and Parts List Parker Hannifin Corporation Hydraulic Pump/Motor Division Greeneville, Tennessee USA REMO INFORMA THIRD ANGLE PROJECTION AND PROP DIVISIO...
  • Page 14 Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Left-hand Unit Exploded View & Parts List (page 1 of 4) ITEM QTY PART NUMBER DESCRIPTION 020207 FLANGE HEAD CAP SCREW, 5/16-18 UNC-3A X 0.75 452016 TRUNNION ARM 020297 SOCKET HEAD CAP SCREW, 3/8-16 UNRC-3A X 1.5...
  • Page 15 Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Left-hand Unit Exploded View & Parts List (page 2 of 4) ITEM PART NUMBER DESCRIPTION 020207 FLANGE HEAD CAP SCREW, 5/16-18 UNC-3A X 0.75 Fan & Pulley Detail 025113 NUT 1-20 UNEF-2B...
  • Page 16 Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Left-hand Unit Exploded View & Parts List (page 3 of 4) Housing and Control Detail TORQUE TO TORQUE TO 100-120 in-lbs 200-240 in-lbs 20A 21B BYPASS VALVE (TRUNNION ARM SEAL - PN 478087)
  • Page 17 Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Left-hand Unit Exploded View & Parts List (page 4 of 4) ITEM QTY PART NUMBER DESCRIPTION 410123 BYPASS VALVE ASSEMBLY 020297 SOCKET HEAD CAP SCREW, 3/8-16 UNRC-3A X 1.5 410124...
  • Page 18 Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Right-hand Unit Exploded View & Parts List (page 1 of 4) ITEM PART NUMBER DESCRIPTION 452028 ROTATING BRACKET 020207 FLANGE HEAD CAP SCREW, 5/16-18 UNC-3A X .75 452011 CONTROL BLOCK 020297 SOCKET HEAD CAP SCREW, 3/8-16 UNRC-3A X 1.5...
  • Page 19 Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Right-hand Unit Exploded View & Parts List (page 2 of 4) ITEM PART NUMBER DESCRIPTION 020207 FLANGE HEAD CAP SCREW, 5/16-18 UNC-3A X .75 Fan & Pulley Detail 025113 NUT 1-20 UNEF-2B...
  • Page 20 Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Right-hand Unit Exploded View & Parts List (page 3 of 4) Housing and Control Detail TORQUE TO TORQUE TO 100-120 in-lbs 115-135 in-lbs MOTOR RTN SCREW TRUNNION BYPASS VALVE (TRUNNION ARM...
  • Page 21 Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Right-hand Unit Exploded View & Parts List (page 4 of 4) ITEM PART NUMBER DESCRIPTION 021393 SPECIAL BOLT, 3/8-24 UNF-2A X 6.625 452020 TRUNNION BLOCK 023002 THREAD FORMING SCREW, 1/4-20 X .625...

  • Page 22: Service Kit Information

    Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Service Kit Information Parker Hannifin Corporation Hydraulic Pump/Motor Division Greeneville, Tennessee USA UNLESS OTHERWISE SPECIFIED INTERPRET PER ASME Y14.5M-1994 ANGULAR DIMENSIONS ±2° SURFACE ROUGHNESS TOLERANCE ON DECIMALS 1 PLACE 2 PLACE...
  • Page 23 Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Service Kit Information (page 1 of 3) SK000275 HTG SERVICE KIT, FAN (8.3” Fan) Item Part Number Description 25164 477370 Fan Spacer 420067 Fan (8.3”) SK000275 Sheet 3 Service Bulletin...
  • Page 24 Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Service Kit Information (page 2 of 3) SK000282 HTG SERVICE KIT, BRAKE (5 Bolt Drum) Item Part Number Description 040204 Cotter Pin 490164 Brake Assembly 490216 Drum Assembly 020207 Flange Head Screw...
  • Page 25 Service Manual HY13-1524-002-M1/US General Information HTG Series Integrated Hydrostatic Transmission Service Kit Information (page 3 of 3) SK000288 TG SERVICE KIT, MOTOR SERVICE (Motor Seal Kit) Item Part Number Description 478035 Dirt & Water Seal 028515 Backup Ring 029118 Backup Washer...

  • Page 26: Warnings

    Keep parts separate to avoid nicks and burrs. Replace all seal rings and any damaged or worn parts with genuine Parker or OEM approved service parts. Parker Hannifin Corporation...

  • Page 27: Disassembly & Inspection

    HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Begin HTG Disassembly 1. Thoroughly clean unit free of grass and other debris. Let dry and place on a Remove HTG Transmission clean work table.
  • Page 28 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction 3. Pull brake hub off brake assembly. Remove brake assembly. 1. Loosen and remove the 4 bolts from the brake assembly using a ratchet and a 5/16”...
  • Page 29 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction 2. Gently pull out filter by hand. Drain oil from unit. Remove the fan nut. 1. With a ratchet and a 15/16” socket, loosen and remove the fan/pulley nut.
  • Page 30 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Remove pulley. 1. Use an OEM pulley puller or equivalent standard 2-jaw or 3-jaw puller to remove the pulley.
  • Page 31 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Remove four bolts from inside 1. Loosen and remove four bolts from in- pump side the pump using a ratchet and a 9/16”...
  • Page 32 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Remove bottom cover 1. Using ratchet and a 3/8” socket , loosen the 10 screws from the bottom cover.
  • Page 33 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Remove charge pump cover 1. Inspect inside of charge pump cover for any scoring. 2. Replace if necessary. Remove gerotor set 1.
  • Page 34 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Remove shock valve caps 1. There are two caps, one on each side of the endblock. 2. Remove each cap using a ratchet and a 5/16”...
  • Page 35 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Inspect port plate 1. Inspect port plate for any damage. 2. If the brass side of the port plate has heavy scoring, replace with a new port plate.
  • Page 36 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Remove control block The control block should slide off the trunnion shaft. However, you may need to use a flat head screwdriver to gently loosen it.
  • Page 37 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Remove pump shaft and Tap top of shaft with a rubber mallet to bearing assembly loosen. Pull pump shaft out of top of pump housing Keep assembly level, HT-1000™...
  • Page 38 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Disassemble the Motor Mark the motor in a V-pattern before disassembly to ensure the parts are put back in the correct order.
  • Page 39 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Remove end cover O-ring seal. NOTE: May need to use a flat head screwdriver to pry O-ring out from the end cover.
  • Page 40 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Remove section seal from both It may be necessary to use a flat head sides of the manifold. screwdriver to lift out the two section seals.
  • Page 41 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Remove the rotor set. Remove section seal from 1. Rotate rotor set over. 2. Remove the section seal from the bottom of rotor set.
  • Page 42 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Remove drive link. 1. While motor housing is in vise, use hands to gently rotate the drive link out of the shaft.
  • Page 43 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Disassembly & Inspection HTG Series Integrated Hydrostatic Transmission Disassembly and Inspection Step Illustration Instruction Remove the shaft seal 1. Hold the motor on its side. 2. Using fingers, move thrust package on its side, vertical to the motor.
  • Page 44 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Begin Reassembly of HTG Starting with the top housing, clean all parts Motor before reassembly. Start with reassembly of the pump section. Install trunnion arm seal.

  • Page 45: Assembly

    HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Install pump shaft and bearing 1. Install pump shaft and bearing assembly assembly. into top housing 2. Place extended shaft through housing. 3. With the shaft properly aligned to the top housing, lightly tap the bearing assembly with a rubber mallet.
  • Page 46 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Install cradle bushings. 1. Align cradle bushing pin hole to pin loca- tion in top housing. 2. Do not stake pins. 3. Apply HT-1000™ oil on top of each cradle bushing.
  • Page 47 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Install central spring. Place central spring onto pump shaft. Install rotating group assembly. 1. Turn assembly onto side while holding pistons in place.
  • Page 48 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Install valve cap. 1. Capture springs into valve caps. 2. Hand tighten valve caps. 3. Repeat shock valve, springs and valve cap installation on other side.
  • Page 49 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Torque endblock bolts. 1. Torque each bolt in a cross-pattern to 270-300 in-lbs (22.5-25.0 ft-lbs). 2. Apply small amount of HT-1000™ oil to the face of the bottom face of the endblock.
  • Page 50 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Install bottom cover. 1. Place the bottom cover over gasket. 2. If installing a standard rubber gasket, in- sert screws into all holes to keep gasket in place while tightening.
  • Page 51 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Begin Motor Assembly 1. Place motor housing in a soft jawed vice with nose pointed down. 2. Using grease provided in seal kit, apply a layer into front radial bearing.
  • Page 52 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Oil shaft. Apply HT-1000™ oil to help shaft pass through the lip of shaft seal package. Insert shaft into housing. 1. Slightly rotate shaft while pushing down...
  • Page 53 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Install housing face section 1. Apply small amount of clean grease to a seal. new section seal. 2. Assemble seal into the seal ring groove of the housing face.
  • Page 54 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Install rotor thrust washer. 1. Place thrust washer over the tip of the drive link and into the rotor counter bore. 2. Washer should fit flush with top of rotor.
  • Page 55 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Install commutator. Place commutator over the end of drive link onto manifold with seal ring face side up Install commutator ring. Place commutator ring on top of manifold and align the holes up with the bot holes of housing.
  • Page 56 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction 2. Use hand pressure to seat O-rings into grooves. Install three short bolts into 1. Begin hand-tightening in the correct lo- end cover.
  • Page 57 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Install endblock motor bolts. 1. Starting with two longest bolts, insert one into the first tall location on the endblock where the filter tube hanger is located.
  • Page 58 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Install side cover. Place side cover on top of gasket and align the screw holes. Install side cover screws. Place self-tapping screws in all five locations and hand tighten.
  • Page 59 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction Torque nut 1. Using a strap wrench or similar, hold pulling while torquing nut. 2. Torque nut to 55-70 ft-lbs. Fill with HT-1000™ oil.
  • Page 60 HY13-1528-001-M1/US—HTG Series Service Manual Service Manual HY13-1524-002-M1/US Assembly HTG Series Integrated Hydrostatic Transmission Reassembly Step Illustration Instruction 2. Torque brake assembly bolts to 25-28 ft-lbs. Install brake drum. Slide brake drum onto brake assembly, piloting the Woodruff Key into the matching slot.

  • Page 61: Notes

    Service Manual HY13-1524-002-M1/US Notes HTG Series Integrated Hydrostatic Transmission Parker Hannifin Corporation Hydraulic Pump/Motor Division Greeneville, Tennessee USA...

  • Page 62: Offer Of Sale

    THE SOFTWARE IS ERROR-FREE OR FAULT-TOLERANT, OR THAT Buyer for the supply of Products. BUYER’S USE THEREOF WILL BE SECURE OR UNINTERRUPTED. UNLESS OTHERWISE AUTHORIZED IN WRITING BY SELLER, THE Seller: means Parker-Hannifin Corporation, including SOFTWARE SHALL USED CONNECTION WITH all divisions and businesses thereof.
  • Page 63 assuring that all performance, endurance, maintenance, safety and warning use thereof and subject to compliance with any other terms provided with requirements of the application of the Products are met. Buyer must the Software. analyze all aspects of the application and follow applicable industry Indemnity for Infringement of Intellectual Property Rights.
  • Page 64 Parker Hannifin Corporation Hydraulic Pump/Motor Division 2745 Snapps Ferry Road Greeneville, TN 37745 USA Tel. 423-639-8151 www.parker.com/pmd...

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