Traction Circuit Relief Valve (R3) And (R4) Pressure Test - Toro GroundsmasterR 4300-D Service Manual

Traction Circuit Relief Valve (R3) and (R4) Pressure Test

TO MOW CONTROL
(FRONT CUTTING UNITS)
TO MOW CONTROL
(REAR CUTTING UNITS)
PISTON
(TRACTION)
PUMP
The traction circuit relief pressure test should be per-
formed to make sure that forward and reverse traction
circuit relief pressures are correct.
Procedure for 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.
Hydraulic System
TO STEERING CONTROL VALVE AND CHARGE CIRCUIT
TO LIFT CONTROL MANIFOLD
GEAR
PUMP
BYPASS
VALVE
FROM STEERING CONTROL VALVE
Figure 32
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.
4. Locate traction circuit test port for direction to be
tested. Forward test port is located on hydraulic tube be-
tween front wheels (Fig. 33). Reverse test ports are lo-
cated on AWD hydraulic manifold (Fig. 34). Thoroughly
clean test port.
Page 4 - - 34
FORWARD (R3) RELIEF
VALVE TEST SHOWN
CROSSTRAX
MANIFOLD
CAUTION
Groundsmaster 4300--D