Groundsmaster 4300--DHydraulic System Page 4 -- 34
Traction Circuit Relief Valve (R3) and (R4) Pressure Test
Figure 32
GEAR
PUMP
CROSSTRAX
MANIFOLD
BYPASS
PISTON
(TRACTION)
PUMP
VALVE
FROM STEERING CONTROLVALVE
TO LIFT CONTROL MANIFOLD
TO STEERING CONTROL VALVE AND CHARGE CIRCUIT
FORWARD (R3) RELIEF
VALVE TEST SHOWN
TO MOW CONTROL
(REAR CUTTING UNITS)
(FRONT CUTTING UNITS)
TO MOW CONTROL
PRESSURE
GAUGE
The traction c ircuit relief pressure test should be per-
formed to make sure that forward and reverse traction
circuit relief pressures are correct.
Procedure f or Traction Circuit Relief Valve (R3)
and
(R4) Pressure
Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes.
2. Drive machine to an open area. Park machine on a
level surface with the cutting decks lowered and PTO
switch off. Make sure engine is off. Apply the parking
brake.
3. Read Precautions For Hydraulic Testing in this sec-
tion.
CAUTION
Before opening hydraulic system, operateall 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.
4. Locate traction circuit test port for direction to be
tested. Forward test port islocated onhydraulic tube be-
tween front wheels (Fig. 33). Reverse test ports are lo-
cated on AWD hydraulic manifold (Fig. 34). Thoroughly
clean test port.
