Procedure for Counterbalance Pressure Test
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.
C. To decrease pressure setting, turn the adjust-
mentscrew onthevalve inacounterclockwise direc-
tion. A 1/8 turn on the screw will make a measurable
change in counterbalance pressure.
1.
D. Tighten locknut to secure adjustment. After ad-
justment, recheck counterbalance pressure. Re-
adjust as needed.
2.
lowered and off. Make sure engine is off and the parking
brake is engaged. Remove console cover.
Parkmachineonalevelsurfacewiththecuttingdeck
9.
When testing is completed, disconnect pressure
gauge from test port.
CAUTION
4
3
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.
Circuit Charge Pressure in this chapter).
Determine system charge pressure (see Traction
4.
ance test port on manifold under console (Fig. 25).
Connect a 1000 PSI (70 bar) gauge to counterbal-
1
5.
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
After installing pressure gauge, start engine and run
Figure 25
6.
with no load on the system. Do not engage the cutting
deck.
Operate the engine at full engine speed (2870 RPM)
1.
2.
Counterbalance test port
Counterbalance valve
3.
4.
Locknut
Adjusting screw
GAUGE READING TO BE 225 PSI (15.5 bar) over
system charge pressure (e.g. if charge pressure is
250
PSI (17.2 bar), counterbalance pressure should
be 475 PSI (32.7 bar)).
7.
8.
Stop the engine and record test results.
Adjustment of the counterbalance valve can be per-
formed as follows:
NOTE: Do not remove the counterbalance valve
from the hydraulic manifold for adjustment.
A. Loosen locknut on counterbalance valve (Fig.
25).
B. To increase pressure setting, turn the adjust-
ment screw on the valve in a clockwise direction. A
1/8
turnonthescrewwillmakeameasurablechange
in counterbalance pressure.
Groundsmaster 4100--D
Page 4 -- 37
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
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|
| Document Type | Service Manual |
| Language | English |
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