Hydro-Gear HGM-C Service And Repair Manual Download Page 3

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HGM-C LSHT Wheel Motor

Headquartered in Sullivan, Illinois,

Hydro-Gear

is a world leader in the design,

manufacture, and service of quality hydrostatic

transaxles for the lawn and garden industry.

The mission of our company is to be recog-

nized by our customers and the industry as a

world-class supplier and the quality leader in

everything we do.
This Service and Repair Manual is designed

to provide information useful in servicing and

troubleshooting the Hydro-Gear HGM - C mo-

tor.
It is necessary, and a good shop practice, that

your service area be equipped with the proper

tools and the mechanics be supplied the latest

information available. All repair procedures

illustrated in this guide are suggested, but pre-

ferred methods of repair.

Internal repair procedures require that the motor

be removed from the vehicle.

This is not a certification, test or study guide for

a certification test. If a technician is interested

in certification, they should contact an agent

representing OPEESA (Outdoor Power Equip-

ment and Engine Service Association) at (860)

767-1770 or their Hydro-Gear Central Service

Distributor. Many distributors will be hosting

certification testing. These study guides will

cover most of the products and manufacturers

in our industry.
For more information about Hydro-Gear or our

products, please contact your Central Service

Distributor, or call our Technical Service Depart-

ment at (217) 728-2581.

Forward

Summary of Contents for HGM-C

Page 1: ...HGM C LSHT Wheel Motor Service and Repair Manual BLN 52690 January 2018 ...

Page 2: ...rake Assemblies 4 Notes 19 Disassembly Service Position 5 End Cover 6 Gearwheel Set 7 Cardan Shaft 7 Distributor Plate 8 Output Shaft 8 Needle Bearing 9 Shaft Seal 9 Check Valves 10 Assembly Ball Bearing 11 Check Valves 12 Needle Bearing 12 Output Shaft 13 Retaining Ring 14 Cardan Shaft 14 Distributor Plate 15 Gearwheel Set 15 End Cover 16 Table of Contents ...

Page 3: ...ed the latest information available All repair procedures illustrated in this guide are suggested but pre ferred methods of repair Internal repair procedures require that the motor be removed from the vehicle This is not a certification test or study guide for a certification test If a technician is interested in certification they should contact an agent representing OPEESA Outdoor Power Equip me...

Page 4: ...eplacement must be replaced from the appropriate kits identified in the Items Listing found at the end of this manual Use only original Hydro Gear replacement parts found in BLN 51427 CD General Description Hydro Gear HGM C wheel motors convert hydraulic energy pressure and oil flow into mechanical energy torque and speed Hydro Gear wheel motors are of a fixed displacement LSHT design For a given ...

Page 5: ...ress REQUIRED TORQUE VALUES Item Description Torque Operation 1 Castellated nut 160 210 ft lbs 217 284 Nm Brake Drum Assembly 22 Screw Hex head 1 4 20 x 1 25 354 in lbs 40 Nm End Cover 29 Bolt 5 16 18 x 75 SHCS 180 240 in lbs 20 3 27 1 Nm Brake Assembly TOOLS As a general rule use the low end of the torque specification on fasteners when reassembling the unit TORQUES ...

Page 6: ... bolts 29 securing the brake assembly to the HGM motor See figure 2 5 Remove the brake assembly See figure 2 Inspection 1 Inspect the studs on drum for wear and or damage Replace if necessary 2 Inspect the brake assembly i e the brake shoes for wear and or damage Assembly 1 Reassemble all parts in the reverse order of disassembly 2 When tightening the fasteners refer to the table on page 3 for the...

Page 7: ...mark See figure 3 2 Remove the castellated nut 1 See figure 4 3 Remove the woodruff key 6 and the plastic plugs or fittings 8 if installed See figure 4 Drain oil from the motor 4 Remove the retaining ring 2 See figure 5 5 Place the HGM C motor into a holding tool See figure 6 SERVICE PREPARATION Figure 5 Retaining Ring Figure 4 Nut Woodruff Key and Plugs Figure 6 Service position Inspection 1 Insp...

Page 8: ...ee page 5 2 Using a 13mm wrench remove the seven screws 22 See figure 7 3 Remove the seven washers 23 and dis card 4 Remove the end cover 19 by sliding the end cover sideways off the gearwheel set See figure 8 Inspection 1 Inspect for wear or damage 2 Inspect screws 22 threads for wear or damage END COVER Figure 7 Screws Figure 8 End Cover ...

Page 9: ... will help keep parts from falling out 3 Remove second O ring 16 under gear wheel set and discard 4 Dismantle the gearwheel set for inspection if contamination or damage is suspected Inspection 1 Inspect for wear or damage CARDAN SHAFT Disassembly 1 Remove castellated nut 1 woodruff key 6 plastic plugs 8 retaining ring 2 seven screws 22 seven washers 23 end cover 19 and the gearwheel set 17 with O...

Page 10: ... Remove and discard the O ring 13 See figure 11 Inspection 1 Inspect for wear or damage DISTRIBUTOR PLATE Figure 11 Distributor Plate OUTPUT SHAFT Disassembly 1 Remove castellated nut 1 woodruff key 6 plastic plugs 8 retaining ring 2 seven screws 22 seven washers 23 end cover 19 the gearwheel set 17 with O rings 16 18 cardan shaft 15 distributor plate 14 and O ring 13 See pages 4 8 2 Place the mot...

Page 11: ... with a pressing tool See figure 14 Note The needles may fall out of the needle bearing 12 during dismantling and can be retrieved for re use Inspection 1 Inspect for wear or damage Disassembly 1 Remove castellated nut 1 woodruff key 6 plastic plugs 8 retaining ring 2 seven screws 22 seven washers 23 end cover 19 gearwheel set 17 with O rings 16 18 cardan shaft 15 distributor plate 14 O ring 13 an...

Page 12: ...16 18 cardan shaft 15 distributor plate 14 O ring 13 output shaft 7 needle bearing 12 And from the output shaft remove ball bearing 3 washer 4 and output shaft seal 5 See pages 4 9 2 Remove the check valves 11 with a ground 3 5mm screw tap See figure 15 The check valves are pressed in and can be removed by pulling on the tap Inspection 1 Inspect for wear or damage Figure 15 Check Valves Check Valv...

Page 13: ...ydraulic oil and grease rubber parts with clean petroleum jelly 1 Place the bullet on the output shaft 7 and mount the output shaft seal 5 See figure 1 2 Remove the bullet and mount the washer 4 See figure 2 3 Place the ball bearing 3 onto output shaft 7 and press into position See figure 3 Figure 1 Bullet Output Shaft Seal BALL BEARING Figure 3 Ball Bearing Press Tool Figure 2 Washer ...

Page 14: ...figure 4 3 Install the two check valves 11 into their bores See figure 5 4 Seat the check valves 11 by lighty tapping with a rubber hammer See figure 5 CHECK VALVES Figure 4 Service Position Figure 5 Check Valve NEEDLE BEARING Assembly 1 Mount seal 5 washer 4 and ball bearing 3 onto output shaft 7 See page 11 2 Install the check valves 11 3 Place the needle bearing 12 into mo tor housing 9 then pr...

Page 15: ...rd See figure 7 4 The rear of the output shaft 7 must be marked before fitted into motor housing 9 The mark must be positioned vertically above a commutation slot leading up to the front annular channel See figure 8 5 Grease the journals with hydraulic oil 6 Position output shaft 7 over motor hous ing 9 and carefully lower into the motor housing 9 Press the output shaft with ball bearing washer an...

Page 16: ...re 12 Cardan Shaft Marks Motor housing not shown Figure 11 O ring Cardan Shaft RETAINING RING Assembly 1 Mount seal 5 washer 4 and ball bearing 3 onto output shaft 7 See page11 2 Install check valves 11 needle bearing 12 output shaft assembly and retaining ring 2 See pages 12 14 3 Turn motor housing 9 so that its rear end is upwards and install a new O ring 13 See figure 11 4 Guide the cardan shaf...

Page 17: ...12 output shaft assembly retaining ring 2 and O ring 13 See pages 12 14 3 Turn the distributor plate 14 so that the slots are against the motor housing 9 and indentation in the distributor plate is pointing to port surface See figure 13 Assembly 1 Mount seal 5 washer 4 and ball bearing 3 onto output shaft 7 See page 11 2 Install check valves 11 needle bearing 12 output shaft assembly retaining rin...

Page 18: ...eel set 17 with non through splines place the gearwheel set 17 with the recess in the spline hole facing down towards the motor housing 9 5 Fit the gearwheel set 17 on the cardan shaft 15 so that the top of the tooth in the external teeth of the gearwheel is vertically over the mark on the cardan shaft 6 Turn the gearwheel set 17 counter clock wise until the cardan shaft 15 and the internal gearwh...

Page 19: ...D COVER continued Figure 18 Torque Sequence Assembly 3 Install the woodruff key 6 nut 1 and plastic plugs or fittings 8 See figure 19 NOTE If the drum assembly or hub assembly is removed from the axle shaft the drum hub assembly must be discarded and replaced with a new assembly 4 Refer to page 4 for brake hub installation instructions Assembly ...

Page 20: ...PARTS LIST 1 Castellated nut 2 Retaining Ring 3 Ball Bearing 4 Washer 5 Shaft Seal 6 Woodruff Key 7 Output Shaft 8 Plastic Plugs 9 Housing 11 Check Valve 12 Needle Bearing 13 O ring 14 Distributor plate 15 Cardan Shaft 16 O ring 17 Gearwheel set 18 O ring 19 End Cover 20 Label 22 Screw 23 Washer 200 Seal Kit Exploded View ...

Page 21: ...NOTES HGM C LSHT Wheel Motor 19 ...

Page 22: ...NOTES 20 HGM C LSHT Wheel Motor ...

Page 23: ......

Page 24: ... 2008 HYDRO GEAR Printed in U S A Rev P4 ...

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