Procedure for Traction Circuit Relief Pressure Test
Make sure hydraulic oil is at normal operating tem-
1
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
CAUTION
Movemachinetoanopenarea,awayfrompeople
and obstructions.
2
Figure 26
2.
turn the engine off and engage the parking brake.
Drive machine to an open area, lower cutting units,
1.
2.
Forward traction port (faces forward)
Reverse traction port (faces rearward)
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS, and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
2
3.
Connect a 10,000 psi gauge to traction circuit test
port for function to be checked (Fig. 26). Test ports are
located on hydraulic lines toward the front of machine.
Forward traction port faces the front and reverse port
faces rearward.
3
1
4.
+
Starttheengineandmovethrottletofullspeed(2800
50 RPM). Release parking brake.
Figure 27
1.
2.
Forward relief valve
Reverse relief valve
3. Traction pump
5.
traction pedal in the appropriate direction. While pu-
shing traction pedal, look at pressure reading on gauge:
Sitonseat,applybrakesfully,andslowlydepressthe
GAUGE READING TO BE:
Forward: 5000 PSI
Reverse: 5000 PSI
6.
If traction pressure is too low, inspect traction pump
relief valves in piston (traction) pump (Fig. 27). Clean or
replace valves as necessary. These cartridge type
valves are factory set and are not adjustable. If relief
valves are in good condition, piston (traction) pump,
wheel motors, and/or rear axle motor should be sus-
pected of wear and inefficiency.
NOTE: Forward and reverse relief valves are identical.
Relief valves can be switched in piston (traction) pump
to help in identifying a faulty relief valve.
Groundsmaster 4500--D/4700--D
Page 4 -- 29
Hydraulic System (Rev. A)
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