Hydro-Gear HGM-C Installations- und Betriebsanleitung
HGM-C
LSHT Wheel Motor
Service and Repair Manual
BLN-52690
January 2018
i HGM-C LSHT Wheel Motor
Foreword ..................................................... 1
How to use this manual ............................... 2
General Instructions .................................... 2
General Description..................................... 2
Tools ............................................................ 3
Torques........................................................ 3
Exploded View/ Parts List............................ 18
Drum & Brake 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
HGM-C LSHT Wheel Motor 1
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 certication, test or study guide for
a certication test. If a technician is interested
in certication, 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
certication 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
2 HGM-C LSHT Wheel Motor
How to Use This Manual
Each subassembly illustrated in this manual is
illustrated with an exploded view showing the
parts involved. The item reference numbers
in each illustration are for assembly instruc-
tions only. See page 18 for part names and
descriptions. A complete exploded view and
item number list of the HGM - C motor is on
page 18.
General Instructions
Cleanliness is a primary means of assuring
satisfactory life on repaired units. Thoroughly
clean all exposed surfaces prior to any type of
maintenance. Clean all parts carefully with low
aromatic kerosene.
As with any precision equipment, all parts must
be kept free of foreign material and chemi-
cals.
Protect all exposed sealing surfaces and open
cavities from damage and foreign material. The
external surfaces should be cleaned before
beginning any repairs.
Upon removal, it is recommended that seal and
O-rings be replaced. Before assembly, lubricate
all metal parts with hydraulic oil and lightly
grease rubber parts with petroleum jelly.
Parts requiring replacement must be replaced
from the appropriate kits identied 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 ow) into
mechanical energy (torque and speed). Hydro-
Gear wheel motors are of a xed displacement
LSHT design. For a given displacement (size of
motor) the speed is determined by the oil ow
rate and the torque is determined by the pres-
sure differential.
The operating principle of the motor is based
on an internal gearwheel that moves about an
eccentric, while rotating and advancing on the
rollers in the external gearwheel.
As oil ow enters the working port it is directed
through internal cavities to ports in the bore of
the housing to valving slots on the output shaft
through the distributor plate to drive the gear-
wheel set. The cardan shaft rotates and trans-
fers mechanical energy from the gearwheel to
the output shaft.
How to Use This Manual
“All uids and cleaning materials should
be handled and disposed of according
to local, state, and federal regulations.”
Note: “Any and all Hydro-Gear components
removed and replaced during service are
recyclable.”
HGM-C LSHT Wheel Motor 3
REQUIRED TOOLS
Flat Blade Screw Driver (2)
Torque Wrench
Rubber or Neoprene Mallet
13mm Wrench
Snap Ring Removal Tool
3.5mm Screw tap
Hydraulic Press
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 specication on fasteners when reassembling the unit.
TORQUES
4 HGM-C LSHT Wheel Motor
Cotter Pin
Castellated Nut (1)
Drum Assembly
Brake Assembly
Bolt (29)
HGM Motor
Disassembly
1. Remove the cotter pin. See gure 1.
2. Remove the castellated nut (1). See gure
1.
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.
3. Remove the drum assembly. See gure 1.
4. Remove the four bolts (29) securing
the brake assembly to the HGM motor.
See gure 2.
5. Remove the brake assembly. See gure 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 required torque val-
ues.
NOTE: As a general rule, use the low end of
the torque specication on fasteners
when reassembling the unit.
DRUM & BRAKE ASSEMBLY
Figure 1, Drum Assembly
Figure 2, Brake Assembly
HGM-C LSHT Wheel Motor 5
Castellated Nut (1)
Retaining Ring (2)
Holding Tools
Woodruff Key (6)
Plugs (8)
Figure 3, Identication Mark
1. To ensure correct alignment and location
during reassembly of motor parts, provide
a “V” shaped identication mark. See gure
3.
2. Remove the castellated nut (1).
See gure 4.
3. Remove the woodruff key (6) and the plastic
plugs or ttings (8), if installed. See gure
4. Drain oil from the motor.
4. Remove the retaining ring (2).
See gure 5.
5. Place the HGM-C motor into a holding
tool. See gure 6.
SERVICE PREPARATION
Figure 5, Retaining Ring
Figure 4, Nut, Woodruff Key and Plugs
Figure 6, Service position
Inspection
1. Inspect woodruff key (6) for wear or dam-
age.
6 HGM-C LSHT Wheel Motor
End Cover (19)
Screw (22)
Disassembly
1. Remove castellated nut (1), woodruff key
(6), plastic plugs (8), and retaining ring (2).
See page 5.
2. Using a 13mm wrench — remove the seven
screws (22). See gure 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 gure 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
HGM-C LSHT Wheel Motor 7
Gearwheel Set (17)
Cardan Shaft (15)
O-ring (18)
GEARWHEEL SET
Figure 9, Gearwheel Set
Disassembly
1. Remove castellated nut (1), woodruff key
(6), plastic plugs (8), retaining ring (2),
seven screws (22), seven washers (23), and
the end cover (19). See pages 5 and 6.
2. Remove the O-ring (18) and gearwheel set
(17). Discard O-ring (18). See gure 9.
Note: Placing ngers underneath gearwheel
set 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-rings (16, 18). See gure 4 - 7.
2. Remove the cardan shaft (15).
See gure 10.
Inspection
1. Check for wear and/or damage to the indi-
vidual splines on the cardan shaft (15).
Figure 10, Cardan Shaft
8 HGM-C LSHT Wheel Motor
Distributor Plate (14)
O-ring (13)
Cardan Shaft (15)
Figure 12, 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), and cardan shaft (15).
See pages 4 - 7.
2. Remove the distributor plate (14).
3. Remove and discard the O-ring (13).
See gure 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 motor in a hydraulic press — re-
place the cardan shaft (15) and press out
the output shaft (7). See gure 12.
Inspection
1. Inspect for wear or damage.
Inhaltsverzeichnis
Andere Hydro-Gear Motor Handbücher
