Service Manual

Rev. C

Reelmaster 5200-D/5400-DHydraulic System Page 4 - 60

Check/High Pressure Relief Valve Replacement

1. Park machine on a level surface, lower cutting units,

stop engine, engage parking brake, and remove key

from the ignition switch.

2. Remove check/high pressure relief valve hex plug.

3. Remove the valve cartridge assembly. Inspect the

valve and mating seat in the housing for damage or for-

eign 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 circlip. The check valve spring may be removed from

the special plug by pulling out at a s light angle. When re-

assembling, install the check valve spring into the spe-

cial plug with its larger diameter toward the plug, and

snap the valve cartridge into position in the plug.

Note: The forward and reverse valves are different.

The seating surface of the ”reverse” check/high pres-

sure relief valve has a machined groove in it. Installing

the ”reverse” check/high pressure relief valve in the

wrong port may cause performance problems.

5. Reinstall the valve c artridges with O-rings into the

housing and tighten the plugs to a torque of 30 to 70 ft-lb

(41to95N-m).

6. Before starting the engine check the oil level in the

differential 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

transmission for leaks.

1. Forward check/high

pressure relief valve

2. Reverse check/high

pressure relief valve

3. Spring

4. O-ring

5. Plug

Figure 80

MACHINED

GROOVE