Toro Groundsmaster 4100-D Service Manual page 75

Procedure for Cutting Deck Manifold Relief
Pressure Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface with the cutting
decks 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. Locate deck manifold to be tested (Fig. 26). Discon-
nect hydraulic hose at deck manifold port (MP).
NOTE: An alternative to using manifold port (MP)
would be to disconnect the inlet hydraulic hose at the
deck motor.
4. Install tester with pressure gauges and flow meter in
series with the the disconnected hose and hydraulic
manifold port (MP) (or motor inlet if hose was discon-
nected at deck motor).
5. Make sure the flow control valve on tester is fully
open.
6. After installing tester, start engine and run at idle
speed. Check for hydraulic leakage and correct before
proceeding with test.
CAUTION
Keep away from decks during test to prevent per-
sonal injury from the cutting blades.
7. Operate engine at full speed (2730 + 30 RPM). En-
gage the cutting decks.
8. Watch pressure gauge carefully while slowly closing
the flow control valve to fully closed.
9. As the relief valve lifts, system pressure should be
approximately:
3000 PSI for the center deck and left wing deck
2000 PSI for the right wing deck
10.Disengage cutting decks. Shut off engine. Record
test results.
Groundsmaster 4100--D
11. If specification is not met, adjust or clean relief valve
in deck manifold port (R1BY). Adjust relief valve as fol-
lows:
NOTE: Do not remove valve from the hydraulic man-
ifold for adjustment.
A. Remove cap on relief valve with an allen wrench.
B. To increase pressure setting, turn the adjust-
ment screw on the valve in a clockwise direction. A
1/8 turn on the screw will make a measurable change
in relief pressure.
C. To decrease pressure setting, turn the adjust-
ment screw on the valve in a counterclockwise direc-
tion. A 1/8 turn on the screw will make a measurable
change in relief pressure.
D. Reinstall and tighten cap to secure adjustment.
Recheck relief pressure and readjust as needed.
12.Disconnect tester from manifold and hose. Recon-
nect hydraulic hose that was disconnected for test pro-
cedure.
RIGHT
FRONT
1. Center deck manifold
2. LH wing deck manifold
1
1. Deck manifold
2. Relief valve
Page 4 - - 33
3
TO OIL COOLER
1
2
Figure 26
3. RH wing deck manifold
3
2
Figure 27
3. Relief valve cap
Hydraulic System