Procedure for Lift/Lower Circuit Relief Pressure
Test
2
1
NOTE: Before attempting to check or adjust lift pres-
sure, make sure that counterbalance pressure is cor-
rectly adjusted.
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
Make sure hydraulic oil is at normal operating tem-
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingunits
Figure 28
2.
CAUTION
1.
Lift circuit port
Hydraulic reservoir cap
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.
2
3
4
5
3.
Raise seat to gain access to hydraulic test fitting.
Connect a 5,000 psi gauge to lift circuit test port (Fig.
Route gauge hose to allow seat to be safely low-
28).
ered.
4.
Sit on the seat and start the engine. Move throttle to
1
full speed (2730 + 30 RPM).
5.
the cutting units. Momentarily hold the lever with the lift
cylinder at full extension while looking at the gauge.
While sitting on the seat, pull lift lever back to raise
GAUGE READING TO BE 1525 to 1575 PSI.
Figure 29
6.
Stop the engine. If pressure is too high, adjust relief
valve in lift control valve by rotating counterclockwise
(Figure 29). If pressure is too low, check for restriction
in pump intake line. Check the lift cylinder for internal
leakage. If cylinder is not leaking, adjust the relief valve
by rotating clockwise. If pressure is still too low, pump or
lift cylinder(s) should be suspected of wear, damage or
inefficiency.
1.
2.
3.
Control valve assembly
Relief valve assembly
Washers
4.
5.
Spring
Poppet
Groundsmaster 4000--D
Page 4 -- 39
Hydraulic System (Rev. B)
| Categories | Lawn Mower Manual, Toro Lawn Mower Manual |
|---|---|
| Tags | Toro Groundsmaster 4000 D |
| Download File |
|
| Document Type | Service Manual |
| Language | English |
| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
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