Allied Systems Allied H6G Series, Service Manual

Page: 56 / 122

Service
3 - 4
Counterbalance Valve Pressure Check
With the engine shut off, connect one 5000 psi pressure
gauge to Motor Port B. Start the engine and place han-
dlever in
LINE-OUT
to build pressure against the coun-
terbalance valve. Check pressure as indicated in Figure
3-6. Pressure on the B side of the motor is a ratio of the
relief setting of the counterbalance valve. If pressure is
not to specification, do not adjust valve until remaining
pressure diagnostics are performed and other problems
are identified.
Counterbalance Valve Adjustment:
1. Start engine and place handlever in
LINE-OUT
posi-
tion
2. Measure pressure at Motor Port B.
3. Loosen Counterbalance Valve locknut. Turn coun-
terbalance valve adjusting capscrew IN to decrease
pressure and OUT to increase pressure. Adjust pres-
sures as shown in Figure 3-6.
Motor Supply Pressure Check
With the engine shut off, connect one 5000 psi pressure
gauge to Motor Port A and one 5000 psi gauge to Motor
Port B. Disconnect and plug the brake release hose from
the brake. This will lock the winch brake to build pressure
in the motor. Check pressure as indicated Figure 3-6. If
pressure is too high, adjust the load sense relief valve. If
it is too low, proceed with pressure diagnostics to identify
other possible problems. A damaged motor or pump can
cause low pressure at the motor.
Load Sense Valve Adjustment:
1. Leave the brake pressure supply disconnected.
2. Start the engine and operate the winch in
LINE-IN
or
LINE-OUT
.
Figure 3-5 Hydraulic Pressure Test Ports S/N H6G-1021 and above (some items removed for clarity)
BYPASS
BYPASS