Traction Pump Check and High Pressure Relief Valves (Fig. 19)
Forward
Reverse
Figure 19
1. Park the machine on a level surface, lower cutting
un
its, engage parking brake and stop the engine.
2. Remove the check/high pressure relief valve hex plug
(Item 2).
3. Remove the valve cartridge assembly (Item 7). In-
spe
ct the valve and mating seat in the housing for
damage or foreign material. It will be necessary to
replace the center section if the seat is damaged.
IMPORTANT: The relief valves are factory set and
should
not be tampered with, except to replace the
entire valve cartridge.
4. The valve cartridge is retained in the special plug by
a circ
lip (Item 6). The check valve spring (Item 5) may
be removed from the special plug by pulling out at a
slight angle. When reassembling, install the check
valve
spring into the special plug with its larger diameter
toward the plug, and snap the valve cartridge into posi-
tion in the plug.
5. Reinstall the valve cartridges with o-rings into the
ho
using and tighten the plugs to a torque of 30 to
50 ft-lb.
6. Before starting the engine check the oil level in the
di
fferential housing and add the correct oil as necessary.
Start the engine and let it run for one to two minutes,
then turn the engine off and check the oil level again.
Check the transmission for leaks.
Repairs P
age 4 - 30
Rev. C
Groundsmaster
®
455-D
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