Allied Systems Allied H6G Series, Service Manual

Page: 58 / 122

Service
3 - 6
If the
HI-SPEED
pressure is not as specified in Figure
3-6, check for:
1. Improper pilot supply pressure.
2. Malfunctioning solenoid valve.
3. Leaking pressure hoses or fittings.
4. Restriction in pressure hose or manifold port
If the
HI-SPEED
automatic shift down does not function,
check for:
1. Faulty pressure switch or relay.
2. Stuck motor speed spool.
BRAKE-OFF Pressure Check
With the engine shut off, connect 1000 psi pressure gaug-
es on the BR pressure test port, in line on the HS hose,
and in line on the DV hose. Start the engine and measure
pressure at each respective gauge with the
BRAKE-OFF
switch activated.
BRAKE-OFF
mode simultaneously
sends pilot pressures to the brake, the motor speed spool,
and the bypass manifold. This includes a pilot pressure
signal that load senses the pump and elevates the pilot
pressure to each respective port. Therefore, pressures
will be greater than the standby pilot setting. Also, a flow
of several gallons of oil from the DV pilot signal is flooded
into the B motor port for lubrication as the motor circulates
during
BRAKE-OFF
mode. All pressures should be as
specified in Figure 3-6.
If pressures are not as specified in Figure 3-6, check
for:
1. Improper pilot supply pressure.
2. Malfunctioning solenoid valve.
3. Leaking pressure hoses or fittings.
4. Restriction in pressure hose or manifold port.
5. Loose DV lube orifice in B motor port block fitting.
LINE-IN Pressure Check
With the engine shut off, connect a 1000 psi pressure
gauge in line on the RI hose at the logic control manifold.
Start the engine and measure pressure with the handlever
in the
LINE-IN
position. Pressure will be greater than the
standby pilot pressure due to mechanical drag and if there
is resistance on the winch such as a high
FREESPOOL
drag setting. Pressure should be as specified in Figure
3-6.
If the line in pressure is not as specified in Figure 3-6,
check for:
1. Improper pilot supply pressure.
2. Malfunctioning handlever.
3. Leaking pressure hoses or fittings
4. Restriction in pressure hose or manifold port
LINE-OUT Pressure Check
With the engine shut off, connect a 1000 psi pressure gauge
in line on the RO hose at the logic control manifold. Start
the engine and measure pressure with the handlever in
the
LINE-OUT
position. Pressure will be greater than the
standby pilot pressure due to mechanical drag and if there is
resistance on the winch, such as a high
FREESPOOL
drag
setting. Pressure should be as specified in Figure 3-6.
If the line out pressure is not as specified in Figure 3-6,
check for:
1. Improper pilot supply pressure.
2. Malfunctioning handlever.
3. Leaking pressure hoses or fittings.
4. Restriction in pressure hose or manifold port.
Valve Setting Procedures
Load sense relief valve
Disconnect brake hose from logic control manifold. Plug
manifold brake port. Connect a 5000-psi gauge to mo-
tor test Port A. At engine idle, hold winch handlever in
reel-in position for 5 seconds while monitoring gauge.
Adjust valve IN to increase, OUT to decrease. Setting is
3450-3600 psi.
Brake release valve
Connect a 1000-psi gauge at the brake test port and an-
other 1000-psi gauge at the RI (reel-in) test port. At engine
idle, slowly meter handlever into the reel-in position while
monitoring both gauges. Increase handlever stroke until
the RI gauge reaches 148-155 psi; brake pressure should
jump to full pilot supply pressure (275-650 psi) at this point.
If the brake pressure jumps up before the pressure at RI