Checks Before Operation; Checks During Operation; Freespool Drag Adjustment; Hydraulic System Pressure Checks - Allied Systems H6H Service Manual

Service

Checks Before Operation

Check that the wire rope and hook are not worn or
damaged. 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
operation. 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.
Figure 3-3 FREESPOOL Adjustments
CAUTION
Setting the preload on the intermediate shaft
too tight will cause bearing overload. Setting
the preload too loose will allow shaft to not
be parallel. Extreme care must be used when
adjusting FREESPOOL drag. Determine
the correct preload by starting with the
preload too loose, and gradually increase
the preload until the correct resistance to
rotation is achieved. Increase the preload by
turning the adjusting screw by a maximum
of 1/6 rotation (60 degrees), and striking
3 - 2
1. Adjusting Nut
2. Jam Nut
the housing with a hammer to make sure
the bearing is sliding. Check resistance to
rotation after each adjustment.

Hydraulic System Pressure Checks

The hydraulic oil and filter(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.
WARNING
Tractor engine must be shut OFF before
disconnecting drum wire rope. Be careful
when you remove the wire rope from the
drum. The end of the wire rope can move
like a compressed spring, causing an injury
when the ferrule is released from the drum.
WARNING
Always wear gloves when handling wire
ropes.
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 70°F (20°C).
3. Remove any dirt from the left side of the winch.
Remove 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
perform the hydraulic pressure checks: four 1000 psi
®