Procedure for Lift/Lower Circuit Relief Pressure
Test
3
NOTE: Before attempting to check or adjust lift pres-
sure, make sure that counterbalance pressure is cor-
rectly adjusted.
2
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.
Parkmachineonalevelsurfacewiththecuttingdeck
4
1
Figure 41
CAUTION
1.
2.
Fan drive manifold
Lift circuit test port
3.
4.
Lift control valve
Relief valve
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
3.
Raise seat to gain access to hydraulic test fitting.
Connect a 5,000 PSI (345 bar) gauge to lift circuit test
port(Fig.41).Routegaugehosetoallowseattobesafe-
ly lowered.
4
5
4.
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
After installing pressure gauge, start engine and run
1
5.
(2870
Sit on the seat and operate the engine at full speed
RPM).
6.
While sitting on the seat, pull lift lever back to raise
the cutting deck. Momentarily hold the lever with the lift
cylinder fully retracted (deck fully raised) while looking
at the gauge.
Figure 42
1.
2.
3.
Control valve assembly
Relief valve assembly
Washers
4.
5.
Spring
Poppet
GAUGE READING TOBE2500to2550PSI (173to
175
bar).
7.
8.
valve by rotating counterclockwise (Figure 42). If pres-
sure 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.
Stop the engine and record test results.
If pressure is too high, adjust relief valve in lift control
9.
When testing is completed, disconnect pressure
gauge from test port.
Groundsmaster 4100--D
Page 4 -- 53
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 30413, Toro Groundsmaster Groundsmaster 4100 D |
| Download File |
|
| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
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| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
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