Toro Groundsmaster 4500-D Series Service Manual page 179

Procedure for Lift/Lower Circuit Relief Pressure Test
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
The lift/lower circuit relief pressure test should be performed to make sure that
the cutting unit lift and lower circuit relief pressure is correct.
Prevent personal injury and/or damage to equipment. Read all
WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the
beginning of this section.
1. Make sure hydraulic oil is at normal operating temperature by operating
the machine for approximately ten (10) minutes. Make sure the hydraulic
reservoir is full.
2. Park machine on a level surface with the cutting decks fully raised. Apply
the parking brake and stop engine.
g308511
1. Test port G1
g308512
1. Test port G1
3. Raise and support seat to gain access to lift control manifold
Figure 87). Connect a 350 bar (5000 PSI) pressure gauge with hydraulic
hose attached to lift manifold test port G1. Route gauge hose to allow hood
to be safely lowered.
4. Sit on the seat and start the engine. Increase engine speed to high idle
speed.
5. While sitting on the seat, with the cutting decks fully raised, monitor the
pressure gauge to identify lift/lower circuit pressure with no load. Record
this pressure.
CAUTION
Figure 86
GM4500-D
2. Relief valve
Figure 87
GM4700-D
2. Relief valve
Page 5–77
(Figure 86 or
Hydraulic System: Testing