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GENERAL:
Before attempting disassembly of the PULLMASTER Model HL25 planetary winch, the following instructions for
disassembly and reassembly should be read and understood:
It is suggested that all expendable parts, such as O-rings and oil seals, are not reused on reassembly. Because
the following service instructions cover the HL25 planetary winch with either a gear motor or a piston motor, verify
the proper seal kits are on hand before disassembly. For models with a gear motor, use seal kit (Part No. 23120)
and, providing the hydraulic motor has to be serviced, seal kit (Part No. 23117). Two new roller bearings, item
875, may also be required (Part No. 25352). For models with a piston motor, use seal kit (Part No. 23140).
NOTE: Backup washers may be included with seal kit. Install with oil seals as per instructions. If not present
in seal kit, the oil seals supplied do not require backup washers.
A clean working area is of prime importance, similar to conditions used for service work on any other hydraulic
component.
All parts, as they are removed from the winch assembly, should be inspected for wear and damage. Worn or
damaged parts must be replaced. Thoroughly clean parts before reassembly. Do not use solvent to clean the
brake or clutch friction plates.
During reassembly, lubricate all O-rings and oil seals with grease before installation.
In the following service instructions, reference to parts is made by numbers and shown on the applicable group
drawings. The service instructions cover assembly and disassembly of Model HL25 with either hydraulic gear
or piston motors. Refer to appropriate instructions and group drawing for each motor. The remaining instructions
apply to all Model HL25s.
DISASSEMBLY
For the majority of required service or repair work, disassembly is required only in the brake housing or clutch
housing of the PULLMASTER Model HL25 planetary winch. There are no special tools needed for the service
or repair work and no adjustments or calibrations are necessary. Proceed with the disassembly as follows:
DISASSEMBLY OF HYDRAULIC GEAR MOTOR ASSEMBLY:
If the analysed service or repair work requires access to the interior of the brake housing or clutch housing, the
hydraulic gear motor should not be disassembled. In this case, the hydraulic motor should be removed together
with the motor adaptor as a complete assembly. If a problem has been analysed to be in the hydraulic motor,
proceed with the disassembly as follows:
1) Remove two socket head capscrews, item 849, and lockwashers, item 847, from transfer tube housing, item
846. Remove transfer tube housing from end cover, item 870. Remove and discard O-ring, item 112. If
pressure reducing valve, item 841, is faulty, replace at this time.
2) Press slotted spring pins, item 848, partially out of transfer tube housing, item 846, to release tube locator,
item 848. Remove and discard O-ring, item 113.
3) Remove transfer tube assembly, item 844, from center of motor drive gear, which is part of gear set, item
881. Remove and discard O-ring, item 879.
4) Remove eight hex capscrews, item 951, together with lockwashers, item 953, from motor assembly.
IMPORTANT: Failure to exercise care when removing motor port end cover or gear housing could
permanently damage machined surfaces of these motor components. Take care not
to damage machined surfaces of motor components at disassembly.
5) Remove (pry loose if necessary) port end cover, item 870, together with bearings, item 875, and ring seal,
item 877. Thrust plate, item 885, and dowel pins, item 865, may stay in gear housing.
SERVICE INSTRUCTIONS
313 REV.970901
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