Toro Groundsmaster 4100-D Service Manual page 85

Procedure for Rear Traction Circuit (RV) Relief Pres-
sure Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
2. Park machine on a level surface with the cutting deck
lowered and off. Make sure engine is off and the parking
brake is engaged.
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.
3. Measure and record traction circuit pressure redu-
cing valve (PR) pressure (see Traction Circuit Pressure
Reducing Valve (PR) Pressure Test in this section).
4. Connect a 1000 PSI (70 bar) pressure gauge to test
port on 4WD manifold under radiator. This is the same
pressure gauge position as used to measure traction cir-
cuit pressure reducing valve (PR) pressure.
5. After installing pressure gauge, start engine and run
at idle speed. Check for hydraulic leakage at pressure
gauge location and correct before proceeding with test.
6. Move throttle so engine is running at high idle speed
(2870 RPM).
7. Operate the machine in Low speed (4WD) with the
cutting deck lowered. Drive down a slope in a forward di-
rection, decrease pressure on the traction pedal and
monitor the pressure gauge. Pressure should increase
until the rear traction relief valve (RV) lifts. Record test
results.
8. Stop engine and record test results.
9. Relief (RV) pressure should be approximately 750
PSI (52 bar) and at least 100 PSI (7 bar) higher than
the traction circuit pressure reducing valve (PR)
pressure (e.g. if the pressure reducing valve (PR) pres-
sure is 650 PSI (45 bar), relief (RV) pressure should be
at least 750 (52 bar) but not much higher).
Groundsmaster 4100--D/4110--D
10.If specification is not met, clean or adjust relief valve
(RV) in 4WD control manifold. Relief valve (RV) is lo-
cated on the lower, front side of the 4WD control man-
ifold (Fig. 35). See Adjust Control Manifold Relief Valves
in the Adjustments section of this chapter for the valve
adjustment procedure. Recheck relief valve (RV) pres-
sure setting after adjustment and readjust as needed.
11. When testing is completed, disconnect pressure
gauge from manifold test port.
1. 4WD control manifold
1
1. Manifold: front side
Page 4 - - 47 Rev. A
1
2
Figure 34
2. Pressure test port
2
Figure 35
2. Relief valve (RV)
Hydraulic System