Allied H6G, Service Manual

Page: 44 / 112

Service
3 - 2
Checks Before Operation
Check that the wire rope and hook are not worn or dam-
aged. Check that the periodic inspection and maintenance
have been done at the recommended operating hours.
See the Maintenance Schedule.
Checks During Operation
The Troubleshooting Charts in Section 2 can be used by
the operator to identify a problem with the winch opera-
tion. A trained service person is needed for additional
troubleshooting and repair that requires disassembly of
parts of the winch.
FREESPOOL Drag Adjustment (Fig. 3-3)
The preload on the bearings of the intermediate shaft
controls the resistance to rotation of the drum during
FREESPOOL operation. The resistance to rotation is
correct when the drum can be rotated by hand, but will
not rotate more than one-half revolution after the hand
is removed.
An adjusting setscrew is located in the center of the cover
for the intermediate shaft. This screw can be tightened or
loosened to adjust the preload on the intermediate shaft.
The jam nut will maintain the
FREESPOOL setting. This
adjustment is normally only necessary if the winch has
had an overhaul.
Tractor engine must be shut OFF before dis-
connecting drum wire rope. Be careful when
you remove the wire rope from the drum. The
end of the wire rope can move like a com-
pressed spring, causing an injury when the
ferrule is released from the drum.
Always wear gloves when handling wire rope.
2. Start the engine and place the winch in LINE-OUT
to raise the oil temperature. Another way to elevate
the reservoir temperature is to hold the tractor blade
over relief. The oil temperature in the winch or tractor
reservoir must be at least 20°C (70°F).
3. Remove any dirt from the left side of the winch. Re-
move control valve access plate.
4. Stabilize engine speed at idle RPM for all tests.
5. Leave test plugs securely installed unless testing
that port.
6. After completing all pressure checks and making the
necessary adjustments, ensure that all plugs and
hoses are securely installed.
7. Install side covers and tighten capscrews.
Pressure gauges
Six calibrated pressure test gauges are required to per-
form the hydraulic pressure checks: four 1000 psi (6895
kPa) and two 5000 psi (34,474 kPa) test gauges.
Standby Pilot Supply Pressure Check
With the engine shut off, connect a 1000 psi gauge to the
tractor pilot test port. This is behind the battery access
panel and is the quick-connect port on the pilot reducing
manifold (see tractor Service Manual). Start the engine
and follow procedure in Figure 3-5. Adequate standby pilot
supply is required for both tractor and winch functions.
If the pressure is not as specifi ed, check for:
1. Improper pilot supply reducing valve setting or mal-
function (See tractor Service Manual)
2. Pump standby pressure setting incorrect (See tractor
Service Manual)
Figure 3-3 FREESPOOL Adjustments
1. Adjusting Nut
2. Jam Nut
Hydraulic System Pressure Checks
The hydraulic oil and fi lter(s) should be maintained as
indicated in the tractor Service Manual. If any problems
are found, they should be corrected before operating the
winch.
Preparation
1. These tests should be performed with a bare drum
(no wire rope) since the drum will rotate during the
tests.