Procedure for Counterbalance Pressure Test
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic 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 lock nut 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.
Parkmachineonalevelsurfacewiththecuttingdeck
10.When testing is completed, disconnect pressure
gauge from manifold test port. Install controller cover.
3.
Remove controller cover to gain access to lift/lower
manifold (Fig. 30).
2
CAUTION
RIGHT
FRONT
3
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.
4
4.
Circuit Charge Pressure in this section).
Determine system charge pressure (see Traction
5.
counterbalance test port G2 on lift/lower manifold under
controller cover (Fig. 31).
Connect a 1000 PSI (70 bar) pressure gauge to
5
6.
at idle speed. Check for hydraulic leakage at pressure
gauge location and correct before proceeding with test.
After installing pressure gauge, start engine and run
Figure 30
7.
(2870
the cutting deck.
Move throttle so engine is running at high idle speed
RPM) with noload onthe system. Do notengage
1.
2.
3.
Controller cover
Screw (2 used)
Flat washer (2 used)
4.
5.
U--nut (2 used)
Lift/lower manifold
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)).
5
8.
9.
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.
2
4
1
A. Loosen lock nut on counterbalance valve (Fig.
31).
3
B. To increase pressure setting, turn the adjust-
ment screw on the valve in a clockwise direction. A
Figure 31
1/8
turnonthescrewwillmakeameasurablechange
1.
2.
3.
Lift/lower manifold
Test port G2
4.
5.
Lock nut
Adjusting screw
in counterbalance pressure.
Counterbalance valve
Groundsmaster 4100--D/4110--D
Page 4 -- 43
Hydraulic System
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