Transaxle Reassembly; Transaxle With Dump Valve - Gravely Promaster 300 Service Manual

7. To inspect the charge pump assembly, use a 5/32
hex key to remove the cap screws from the charge
pump plate (see Figure 30).
Figure 30
8. Remove the charge pump plate from the housing.
9. Remove the charge pump gerotor from the
housing.
The pump and motor journals and cam ring dowel
cannot be removed once they have been installed in
the housing.
NOTE: Inspect the pump and motor journals for any
irregularities. If any are found, the housing must be
replaced.
In most cases, we do not recommend removal of the
dampening pistons for inspection and cleaning. Normal
flushing should be all that is required for cleaning.
10.To remove the dump valve assembly, first use a 1"
socket or end wrench to remove the dump valve
nut from the housing (see Figure 31).
Figure 31
11.Remove the O-ring from the dump valve nut.
12.After removing the dump valve nut, remove the
dump valve bracket and spring from the housing by
sliding them over and lifting upward.
13.Remove the spring from the dump valve bracket.
14.Remove the O-ring from the dump valve bracket.
We do not recommend removal of the dampening
pistons for inspection and cleaning. Normal flushing
should be all that is required for cleaning.

9.6 TRANSAXLE REASSEMBLY

Before reassembling the transaxle, clean all parts and
assemblies with clean solvent and blow them dry with
compressed air. Inspect and replace all scratched or
damaged parts. Replace all gaskets, seals and seal
rings. Lubricate all seals with petroleum jelly (Vaseline)
for retention during assembly. Freely lubricate all
bearings and finished part surfaces with clean
hydraulic fluid to provide lubrication at start-up.

9.7 TRANSAXLE WITH DUMP VALVE

1. To reassemble the dump valve, first lubricate and
install the o-ring in the groove located in the dump
valve bracket.
2. Install the spring on the dump valve bracket. It
should be installed with the right angle bend of the
spring pointing inward, as shown in Figure 31.
3. Install the spring and dump valve bracket in the
housing.
The spring is properly positioned when the longest leg
points toward the check valve assembly.
4. Lubricate and install the o-ring around the dump
valve nut.
5. Install the nut over the dump valve bracket, into the
housing.
NOTE: Make sure you do not damage the dump valve
o-ring during installation.
6. Using a 1 inch socket or end wrench, torque the
dump valve nut to 150 lb-in (15 Nm).
9 - 28