11 Transmission Teardown
Hydro-Gear 0500 / 0650
11 - 14
Figure 12. Remove Oil Filter
Figure 13. Remove Center Section Assembly
21.Remove the oil filter. After inspecting the filter for
unusual particles that it may have trapped, dispose of
it properly and replace it with a new oil filter during
reassembly.
22.Using a 9/16” socket, remove the three assembly
bolts retaining the center section in the upper housing.
The bolts are sealed in with thread-locking compound
and may require the use of a breaker bar to loosen.
CAUTION: The pump and motor piston springs may
push the center section assembly out of position
while you remove these bolts.
23. Remove the center section assembly from the housing.
The pump block assembly should remain in the upper
housing on the input shaft, but may stick to the center
section.
Check the check valve plate bolt torque (where
applicable), but do not remove. Several styles of
check plates have been used, some use one bolt,
some three and others have four. The plate with four
bolts should be torqued to 170 to 240 in-lbs., while
the plate with three bolts should be torqued to 135 to
185 in-lbs.
CAUTION: The aligning pins, motor shaft, bypass
plate, pump block and motor block assemblies are
NOT retained to the center section or the upper
housing and may become separated from the assembly
during removal.
24.Remove the motor block assembly from the motor
shaft and inspect for unusual wear or damage. The
pistons should fit with very little side clearance in the
block bores, but must slide freely.
NOTE: The correct bore diameter for the block is 0.6776”
to 0.6784” and the pistons should be 0.6767” to 0.6770”.
25.Remove the motor shaft, washers and bypass plate
from the center section and inspect for unusual wear
or damage.
NOTE: Be careful not to lose the bypass plate
26.Inspect the center section running surfaces for
unusual wear or damage.
Figure 14. Center Section / Motor Shaft
Bypass Plate
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