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 (7) Pull cylinder (22) from plunger (29) and
6-193. REPAIR. Repair tilt cylinder parts as follows:
remove bearing (25) from cylinder and bearing (20) from
(1) Repair minor thread damage with tap,
inside of plunger (29).
thread file or thread chaser.
(2) Remove minor surface defects from bore
6-197. CLEANING. Clean disassembled parts of hoist
of cylinder by carefully honing. Remove all traces of
cylinder as follows:
abrasive after honing.
(1) Clean all removed metallic parts with SD
(3) Replace all cracked or distorted parts with
and dry with soft lint-free cloth.
serviceable parts.
(2) Slide secondary cylinder out of primary
(4) Replace wiper ring, packings, backup ring,
cylinder as far as possible and carefully clean exposed
piston packings and piston guide with new parts at each
surface of secondary cylinder with cloth moistened with
reassembly.
SD.
6-194. ASSEMBLY. Thoroughly wet all internal parts
6-198. INSPECTION. Inspect hoist cylinder parts as
with hydraulic fluid before installation. Take particular
follows:
care to keep parts clean during assembly. Proceed as
(1) Inspect all threaded parts and parts with
follows:
tapped holes for stripped threads or other thread
(1) Install piston and rod (17) with ring ( 5) in
damage.
cylinder (18). Fit (12, 13, 14, 15 and 16) into recess in
(2) Inspect packing retainers for scratches,
cylinder, and install stuffing box (9) in cylinder snugly
burrs and upset metal.
with spanner wrench.
(3) Inspect cylinders and plunger for cracks
(2) Slide packing set (11) down piston rod,
and distortion.
carefully entering it into recess of stuffing box.
(4) Inspect external surfaces of secondary
(3) Lubricate and install wiper ring (8) in
cylinder and secondary plunger for scratches, pitting,
recess of packing retainer (5) and install packing
scoring, upset metal and other surface damage.
retainer (loosely at first) with screws (6) and washers (7).
(5) Inspect check valve for free return flow.
(4) Install rod end (I) on piston rod, and
6-199. REPAIR. Repair parts as follows:
replace screw (2), washer (3) and nut (4), but do not
(1) Replace all cracked or distorted parts.
tighten, as rod end final position must be adjusted when
(2) Repair minor thread damage with a tap,
tilt cylinder is installed.
thread file or thread chaser.
(3) Remove minor surface defects on
6-195. HOIST CYLINDER.
surfaces of secondary cylinder and secondary plunger
6-196. DISASSEMBLY. Proceed as follows:
with crocus cloth or with minor honing.
(1) Remove screws (1, figure 7-24) and
(4) Replace all packings and wiper rings with
washers (2). Unscrew cylinder end (3). Remove
new parts at each assembly.
packing (5) and washer (4) from cylinder end.
(2) Unscrew packing nut (6) from plunger
6-200. ASSEMBLY. Take special care to keep all parts
(28). Remove wiper ring (7), packing retainer (8) and
of the hoist cylinder clean during reassembly. Wet
five packings (9).
interior parts with clean hydraulic oil, before installing
(3) Unscrew packing nut (11) from cylinder
them. Reassemble as follows:
(21). Remove wiper ring (12), retainer (13) and five
(1) Install new bearings (25) over secondary
packings (14).
plunger (29). Push plunger into secondary cylinder (22)
(4) Unscrew packing nut (16) from cylinder
from bottom and install new packing (23) and washer
(22). Remove wiper ring (17), packing retainer (18) and
(24) in groove in base of secondary cylinder. Screw
five packings (19).
cylinder end (3) into secondary cylinder.
(5) Unscrew and remove cylinder (21) from
(2) Install bearing (20) in base of secondary
cylinder (22) and remove bearing (15) from inside of
cylinder and install packing (19) against base of bearing.
cylinder.
Insert packing retainer (18). Insert wiper ring (17) in
(6) Remove plunger (28) and remove bearing
packing nut (16) and install packing nut in bottom of
(10) from inside plunger. Remove plunger guide (26)
secondary cylinder.
secured in position with retaining ring (27). Remove
packing (23) and washers (24) from cylinder (22).
6-45
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