Allied H6G, Service Manual

Page: 54 / 112

Service
3 - 4
the motor against the brake before the brake releases.
Note: Some brake valves are not adjustable.
FREESPOOL Pressure Check
With the engine shut off, connect 1000 psi pressure
gauges in line on the FS hose at the logic control manifold,
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
FREESPOOL switch
activated. FREESPOOL mode simultaneously sends pilot
pressures to the FREESPOOL shifter fork, 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. The
FREESPOOL shift fork will shift at a
minimum of 170 psi. All pressures should be as specifi ed
in Figure 3-5.
If pressures are not as specifi ed in Figure 3-5, check
for:
1. Improper pilot supply pressure
2. Malfunctioning solenoid valve.
3. Leaking pressure hoses or fi ttings
4. Restriction in pressure hose or manifold port
5. Loose DV lube orifi ce in B motor port block fi tting.
Figure 3-4 Hydraulic Pressure Test Ports (1) (some items removed for clarity)
Direction Block Tank to Tractor Tank
Direction Block Pressure to Tractor Pump
RI
Pilot
Tank
Reel-Out (RO)
Pilot Supply/Pressure (PP)
Drain (PD)
Logic Control Manifold
HI-SPEED (HS)
Bypass
Bypass Manifold Motor B
Brake (REF.)
FREESPOOL (FS)
Brake (BR)
Direction Manifold
Reel-In (RI)
RO
LS
Motor A
Brake Release Valve (150 psi)
Back Side of Direction Manifold
Counter Balance Valve
Load Sense
Relief (3500 psi)
Figure 3-4 Hydraulic Pressure Test Ports (2)
(some items removed
for clarity)