Procedure for Counterbalance Pressure Test
Make sure hydraulic oil is at normal operating tem-
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
4
2.
Parkmachineonalevelsurfacewiththecuttingunits
lowered and off. Make sure engine is off and the parking
brake is engaged.
3
2
CAUTION
1
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.
Figure 32
3.
1:
Determine system charge pressure (see TEST NO.
Traction Circuit Charge Pressure in this chapter).
1.
2.
Counterbalance test port
Counterbalance valve
3.
4.
Locknut
Adjusting screw
4.
port on manifold under console (Fig. 32).
Connect a 1000 PSI gauge to counterbalance test
5.
(2730
Start the engine and put throttle at full engine speed
+30RPM) withnoloadonthesystem. Donoten-
gage the cutting units.
GAUGE READING TO BE 220 PSI (15.2 bar) over
system charge pressure (e.g. if charge pressure is
250
PSI, counterbalance pressure should be 470
PSI).
6.
Adjustment of the counterbalance valve can be per-
formed as follows:
NOTE: Do not remove the valve from the hydraulic
manifold for adjustment.
A. Loosen locknut on counterbalance valve (Fig.
32).
B. To increase pressure setting, turn the adjust-
ment screw on the valve in a clockwise direction. A
1/8
turnonthescrewwillmakeameasurablechange
in counterbalance pressure.
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.
D. Tighten locknut to secure adjustment. Check
counterbalance pressure and readjust as needed.
Groundsmaster 4000--D
Page 4 -- 43
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 |
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| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
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