Toro Groundsmaster 4100-D Service Manual page 83

Procedure for Traction Circuit Reducing Valve (PR)
Pressure 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. Connect a 1000 PSI (70 bar) pressure gauge to test
port on 4WD control manifold under radiator (Fig. 32).
4. 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.
5. Move throttle so engine is running at high idle speed
(2870 RPM). Make sure that Hi/Low speed switch is in
the Low speed (4WD) position.
6. Sit on seat, apply brakes fully and slowly depress the
traction pedal in the reverse direction. While pushing
traction pedal, look at pressure reading on gauge:
GAUGE READING TO BE approximately 650 PSI
(45 bar).
7. Stop engine and record test results.
8. If specification is not met, clean or adjust pressure
reducing valve (PR) in 4WD control manifold. This valve
is located on the front side of the 4WD control manifold
(Fig. 33). See Adjust Control Manifold Relief Valves in
the Adjustments section of this chapter for the valve ad-
justment procedure. Recheck reducing valve (PR) pres-
sure setting and readjust as needed.
9. When testing is complete, disconnect pressure
gauge from test port on control manifold.
Groundsmaster 4100--D/4110--D
1. 4WD control manifold
2. Pressure test port
1
2
1. Manifold: front side
Page 4 - - 45 Rev. A
1
2
Figure 32
Figure 33
2. Reducing valve (PR)
Hydraulic System