Service Manual

Reelmaster 5010 Series Page 4 - 31
CAUTION
Before opening hydraulic system, operate all hy-
draulic controls to relieve system pressure and
avoid injury from pressurized hydraulic oil. See
Relieving Hydraulic System Pressure in the Gen-
eral Information section of this chapter.
NOTE: If machine is e quipped with optional CrossTrax-
TM
AWD, reverse relief pressure test ports are located on
CrossTrax
TM
hydraulic manifold.
4. Thoroughly clean traction circuit test port on hydrau-
lic tube for direction to be checked (Fig. 25 and 26). Con-
nect a 5000 PSI (350 bar) pressure gauge to test port.
5. After installing tester, start engine and run at idle
speed. Check for any hydraulic leakage from test con-
nections and correct before proceeding with test.
6. Move throttle to full speed (3200 RPM).
7. Sit on seat, and with brakes applied, slowly depress
the traction pedal in the direction to be tested (forward
or reverse). While pushing traction pedal down, careful-
ly watch the pressure gauge needle. As the traction re-
lief valve lifts, the gauge needle will momentarily stop.
Traction system pressure as the relief valve opens
should be:
Approximately 3825 PSI (264 bar) in both forward
(R3) and reverse (R4)
NOTE: If traction pedal continues to be pressed after
the relief valve has opened, system pressure can in-
crease higher than relief pressure.
8. Release traction pedal, stop engine and record test
results.
NOTE: Forward (R3) and reverse (R4) relief valves are
identical. Relief valves can be switched in traction pump
to help in identifying a faulty relief valve.
9. If problem occurs in one direction only, interchange
the relief valves in the traction pump (Fig. 27) to see if
the problem changes to the other direction. Clean or re-
place valves as necessary. These cartridge type valves
are factory set, and are not adjustable. If relief valves are
in good condition, traction pump and/or wheel motors
should be suspected of wear and inefficiency.
10.After testing is completed, make sure that engine is
stopped and then relieve hydraulic system pressure
(See Relieving Hydraulic System Pressure in the Gen-
eral Information section of this chapter). Remove pres-
sure gauge from machine.
1. RH wheel motor
2. LH wheel motor
3. Forward test port
4. Reverse test port
Figure 25
2
3
4
1
FRONT
RIGHT
2WD MACHINE SHOWN
1. Forward test port 2. Reverse test port
Figure 26
1
2
2WD MACHINE SHOWN
1. Pis ton (traction) pump
2. Reverse relief valve (R4)
3. Forward relief valve (R3)
Figure 27
2
3
1
FRONT
RIGHT
Hydraulic
System
Hydraulic System