WINCH MOTORS
SUB-SECTION 5K
entire rear section of the motor from valve housing (20).
Cleanliness is of prime importance when any part of this
Place the rear section of the motor on a suitable protective
unit is disassembled or reassembled. Before starting disas-
surface with the splined end of gear (44) up.
sembly, be sure that a clean work area with a dust and grit
free workbench is available.
15. Remove O-rings (37) and back-up rings (38) from steel
rings (41) which are still in valve housing (29). Remove
DISASSEMBLY. To disassemble the motor proceed as
isolation plates (35), sealing strips (36), and separators (39)
follows (see Figure 5K-9):
and center separator (40), if these items did not drop out
when the rear section of the motor was removed.
1. Clean the outside of the motor with a suitable solvent.
Matchmark the sections of the motor to assure correct
16. Mark the side of body (53) nearest gear (44). Grasp the
reassembly.
gear, and lift it slightly with a quick, upward motion to
dislodge pressure plate (45). Remove the pressure plate.
2. Clamp the motor, output shaft up, across the motor
ports in a vise having protective jaws.
17. Remove gears (43 and 44).
3. Remove nuts (3) and lockwashers (4). Coat the end of
18. Place the thumb of each hand in the gear bores of
the output shaft with clean grease. Lift mounting flange (5)
pressure plate (45), and carefully lift the pressure plate
straight up until it clears the end of the output shaft, and
straight out of body (53). Do not force or pry the pressure
then remove the mounting flange.
plate when removing it.
NOTE
19. Remove isolation plates (47), sealing strips (48), end
separators (52), and center separator (51). Then remove
It may be necessary to tap the mounting flange with a
O-rings (50) and back-up rings (49).
wooden mallet or plastic hammer to loosen it.
20. Remove plugs (30) to gain access to O-rings (31),
4. Remove snap ring (1). Place the mounting flange on
springs (32) and poppets (33).
wooden blocks with seal (2) facing down. Using a suitable
pin punch and hammer, tap around the edge of the seal
INSPECTION. After the motor has been disassembled,
until it can be removed.
wash all parts in a suitable solvent and dry with compressed
air. All parts should be visually inspected for excessive
5. Remove O-ring (6) from the mounting flange.
wear, cracks, or any other damage which would make them
6. Remove back-up rings (9) and O-rings (10) from steel
unfit for further service, with particular attention to the
rings (13). Remove isolation plates (7), sealing strips (8),
following:
end separators (11), and center separator (12).
1. The gears will wear a groove in the sides of the body
7. Marks the side of body (24) nearest gear (16). Grasp
section (item 24) of the motor. The depth of this groove
gear, and lift it slightly with a quick, upward motion to
should be measured. If the depth of the groove is more than
dislodge pressure plate (14). Remove the pressure plate.
0.005 inch (0.127 mm), the motor must be replaced.
8. Remove gears (15 and 16).
2. Inspect the pressure plates for excessive wear. If deep
curved wear marks are visible, the pressure plates should be
9. Lift body (24) over studs (25) and remove it. Remove
replaced.
O-ring (26).
3. Measure the gear journals at a point next to the face of
10. Place the thumb of each hand in the par bores of
the gear, and at a point 1/2-inch (12.7 mm) or more from
pressure plate (17). and carefully lift the pressure plate
the gear face. Compare the two measurements. If the differ-
straight out of body (24). Do not force of pry the pressure
ence in the measurements is more than 0.001 inch (0.025
plate when removing it.
mm), the motor must be replaced. Using the same proce-
dure, measure the journal on the other side of the gear.
11. Remove isolation plates (18), sealing strips (19), back-
up rings (20), O-rings (21), end separators (22), and center
REASSEMBLY. To reassemble a motor which has been
separator (23) from body (24).
completely disassembled, including the bearings, proceed as
follows (see Figure 5K-9):
12. Remove coupling (28). Snap rings (27) will be removed
with the coupling.
1. Place body (53) on a clean workbench with the large
opening up and the mark made in step 16 of disassembly
13. Reclamp the motor across valve housing (29), with the
tail drain port up in the vise.
facing you.
2. Lubricate the inside of body (53) with clean hydraulic
14. Remove nuts (57) and lockwashers (56). Lift end cover
oil. Install O-rings (50) and back-up rings (49) on the
(56) from the motor and remove O-ring (54). Then lift the
5K-10
