Service Manual
Disassembly
Hydraulic Motor type MM, MLHM
- 3 -
Instructions in this manual are for MM and
MLHM motors.
Cleanliness is extremely important when
repairing these motors. Work in clean area!
Before disassembly, drain oil from motor.
Remove key when used. For motors with
drain unscrew drain plug and remove washer (O-
ring for MLHM…4,5,7,8).
Although not all drawings show the motor in
disassembly devise (vise), we recommend that
you keep motor clamped during disassembly.
To ensure correct assembling make a
marking line across the motor parts.
1. For F-flanged motors only! Unscrew the
screws M6x14 and remove flange.
2. Place the motor in disassembly devise with
output shaft down.
Fig. 1
3. Unscrew screws using S6 Allen head
spanner. Remove washers (see Figure 1).
Note: The screws are assembled with Loctite
to hold them in place. A higher torque is required
to break screws loose.
4. Remove end cover.
Fig. 2
5. Remove plate. Remove O-ring from plate
groove (For MM 8 the plate has O-rings from
both sides!) Remove balls (2 pcs.) (see Figure 2).
Fig. 3
6. Remove the roll-gerotor set carefully to
prevent dropping of rotor from stator. Do not
dismount!
Remove O-rings from gerotor set grooves
(see Figure 3).
Fig. 4
7. Remove cardan shaft (see Figure 4).
8. Remove distributor plate. Remove O-ring
from plate groove (For MM 8 the plate has O-
rings from both sides!)
Reposition motor in disassembly devise with
shaft upwards.
9. Unscrew screws using S5 Allen head
spanner (see Figure 5).
Screw
Washer
End Cover
Gerotor
Set
O-Ring
O-Ring
Plate
O-Ring
Ball
Distributor
Plate
Cardan
Shaft
O-Ring