Groundsmaster 4100 --D/4110--D Hydraulic SystemPage 4 -- 43
Procedure for Counterbalance Pressure Test
1. 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.
2. Parkmachineonalevelsurfacewiththecuttingdeck
loweredandoff.Makesureengineis offandtheparking
brake is engaged.
3. Remove controller cover to gain access to lift/lower
manifold (Fig. 30).
CAUTION
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. Determine system charge pressure (see Traction
Circuit Charge Pressure in this section).
5. Connect a 1000 PSI (70 bar) pressure gauge to
counterbalancetestport G2 onlift/lower manifoldunder
controller cover (Fig. 31).
6. After installing pressure gauge, start engineand run
at idle speed. Check for hydraulic leakage at pressure
gauge location and correct before proceeding with test.
7. Move throttle so engine is runningat high idle speed
(2870RPM)withnoloadonthesystem.Donotengage
the cutting deck.
GAUGE READING TO BE 220 PSI (15.2 bar) over
systemcharge pressure(e.g. if charge pressureis
250 PSI (17.2 bar), counterbalance pressure should
be 470 PSI (32.4 bar)).
8. Stop the engine and record test results.
9. 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 lock nut on counterbalance valve (Fig.
31).
B. To increase pressure setting, turn the adjust -
ment screw on the valve in a clockwise direction. A
1/8turnonthescrewwillmakeameasurablechange
in counterbalance pressure.
C. To decrease pressure setting, turn the adjust-
mentscrewonthevalveinacounterclockwisedirec-
tion. A 1/8 turnon the screw will make a measurable
change in counterbalance pressure.
D. Tighten lock nut to secure adjustment. After ad-
justment, recheck counterbalance pressure. Re-
adjust as needed.
10.When testing is completed, disconnect pressure
gauge from manifold test port. Install controller cover.
1. Controller cover
2. Screw (2 used)
3. Flat washer (2 used)
4. U--nut (2 used)
5. Lift/lower manifold
Figure 30
FRONT
RIGHT
2
3
1
4
5
1. Lift/lower manifold
2. Test port G2
3. Counterbalance valve
4. Lock nut
5. Adjusting screw
Figure 31
2
3
4
5
1
Hydraulic
System
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