Procedure for Counterbalance Pressure Test
Make sure hydraulic oil is at normal operating tem-
4
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
3
2
2.
Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied. Remove console cover.
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 25
1.
2.
Counterbalance test port
Counterbalance valve
3.
4.
Lock nut
Adjusting screw
3.
Circuit Charge Pressure Test in this section).
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-
5.
(2870
Start the engine and put throttle at full engine speed
RPM) with noload onthe system. Do notengage
the cutting decks.
GAUGE READING TO BE 220 PSI (15.2 bar) over
system charge pressure (e.g. if charge pressure is
250
PSI (17.2 bar), counterbalance pressure should
be 470 PSI (32.4 bar)).
6.
7.
Stop engine and record test results.
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 lock nut 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.
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 lock nut to secure adjustment. Check
counterbalance pressure and readjust as needed.
8.
When testing is completed, disconnect pressure
gauge from test port.
Groundsmaster 4000--D
Page 4 -- 37
Hydraulic System
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