Toro Groundsmaster 4500-D Service Manual page 73

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 units
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. Determine deck manifold relief to be tested. Discon-
nect the inlet hydraulic hose to the appropriate deck mo-
tor (Fig. 32):
A. For pump section (P1), deck manifold relief is
tested at the inlet to the motor on deck #5.
B. For pump section (P2), deck manifold relief is
tested at the inlet to the motor on deck #1.
4. Install hydraulic flow meter in series with the the dis-
connected hose and deck motor inlet.
5. Make sure the flow control valve on the tester is fully
open.
CAUTION
Keep away from decks during test to prevent per-
sonal injury from the cutting blades.
6. Start engine and move throttle to full speed (2800 +
50 RPM). Engage the cutting units.
7. Watch pressure gauge carefully while slowly closing
the flow control valve to fully closed.
8. As the relief valve lifts, system pressure should be
3400 to 3750 PSI.
9. Disengage cutting units. Shut off engine. If specifica-
tion is not met, clean or replace relief valve (PRV1 or
PRV2) located in the hydraulic deck control manifold
(Fig. 33 and 34).
10.Disconnect tester from motor and hose. Reconnect
hydraulic hose to deck motor.
Groundsmaster 4500--D/4700--D
Rotation Direction
1
1. Pressure IN
2. Pressure OUT
1
GM 4500- -D DECK CONTROL MANIFOLDS
1. Deck 2, 3, & 5 relief valve (pump section P2)
2. Deck 1 & 4 relief valve (pump section P1)
1
GM 4700- -D DECK CONTROL MANIFOLDS
1. Deck 2, 3, 5, & 7 relief valve (pump section P2)
2. Deck 1, 4, & 6 relief valve (pump section P1)
Page 4 - - 35
2
3
Figure 32
3. Case drain
2
Figure 33
2
Figure 34
Hydraulic System (Rev. A)