Procedure for Logic (Counterbalance) Valve (LC1)
Pressure Test:
C. To increase pressure setting, turn the adjust-
mentshaftonthevalveinaclockwisedirection.A1/8
turn on the shaft will make a measurable change in
counterbalance pressure.
NOTE: If the counterbalance system is functioning, the
machine should normally settle slightly when theengine
is started.
D. To decrease pressure setting, turn the adjust-
ment shaft on the valve in a counterclockwise direc-
tion. A 1/8 turn on the shaft will make a measurable
change in counterbalance pressure.
1.
Make sure hydraulic oil is at normal operating tem-
perature.
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingunits
E. Tightenlocknut.Checkcounterbalancepressure
(steps 6 and 7) and readjust as needed.
F. Replace hex cap to Logic valve (LC1).
Shut off engine.
3.
Read Precautions for Hydraulic Testing.
9.
WARNING
10.Relieve hydraulic system pressure (See Relieving
Hydraulic System Pressure in the General Information
section).Disconnecttestgaugewithhosefrommanifold
block. Install plug into hydraulic manifold port (G2) and
torque plug 120 in--lb (13.6 N--m).
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved. See Relieving Hy-
draulic System Pressure in the General Infor-
mation section.
1
4.
Remove plug from hydraulic manifold port (G2) (Fig.
25).
5.
attached to port (G2).
Install hydraulic pressure gauge with hydraulic hose
2
CAUTION
Figure 25
Keepawayfromdecksduringtesttopreventper-
sonal injury from the cutting blades.
1.
Hydraulic manifold
2.
Manifold port (G2)
3
6.
Start engine and move throttle to full speed (3050 +
50
RPM). Do not engage or raise the cutting units.
4
2
7.
250
The standard counterbalance pressure should be
PSI with a range of 180 to 300 psi.
8.
be performed as follows:
Ifnecessary,adjustmentoftheLogicvalve(LC1)can
1
NOTE: Do not remove the Logic valve from the hy-
draulic manifold for adjustment.
Figure 26
3.
4.
A. Remove hex cap from logic valve (Fig. 26).
B. Loosen lock nut.
1.
2.
Manifold assembly
Logic valve (LC1)
Hex cap
Lock nut
Groundsmaster 3505--D
Page 4 -- 39
Hydraulic System
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