Service Manual

Hydraulic

System

Reelmaster 5500-D Hydraulic System (Rev. C)Page 4 - 67

Heat Exchanger By-Pass 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 the heat exchanger bypass valve hex plug

(Fig. 79).

3. Remove the spring and poppet from the housing.

4. Do not interchange parts with another valve. The

spring used in the heat exchanger bypass valve is identi-

fied by a yellow dye mark, and requires a force of

approximately 5.5 lb (24.5 N) to compress it to a length

of 1.280 inch (3.25 cm).

5. Inspect the poppet and mating seat in the end cap for

damage or foreign material.

6. Reinstall the poppet, spring and plug (with O-ring)

into the housing. Tighten the plug to a torque of 30 to 70

ft.-lb (41 to 95 N-m).

7. 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

the transmission for leaks.

1. Plug

2. O-ring

3. Spring

4. Relief valve

Figure 79