SWING REDUCERS
SUB-SECTION 6B
A. Remove five capscrews (13) from port end cover
Cleanliness is of prime importance when any part of this
(19). Lift off the port end cover. Items (1), (2), (3),
unit is disassembled or reassembled. Before starting dis-
(9), (10), (11), (12), (15), and (17) will be removed
assembly, be sure that a clean work area with a dust and
with the port end cover.
grit free workbench is available.
B. Remove snap ring (4) and sleeve (5) from motor shaft
DISASSEMBLY. To disassemble the swing reducer, proceed
(7). Remove capscrews (14) and O-ring (18). Discard
as follows (see Figure 6B-3):
the O-ring.
1. Remove capscrew (46) and wahser (47). Then remove
C. Remove gears (20), and keep them together as they
the swing pinion from output shaft (50). Position the swing
are a matched set. Note which end of the gears were
reducer on suitable wooden blocks, with the output shaft
next to the port end cover.
down, for disassembly. Remove all dirt from the unit with a
suitable cleaning solvent before proceeding with the fol-
lowing instructions.
D. Remove key (6) from the motor shaft, and remove
gear housing (21). Remove the second O-ring (18)
2. Remove pipe plug (35) from end cover (40), and drain
from the other side of the gear housing and discard it.
the oil from the unit. Remove one capscrew (75) from
spring cover (77) to allow air to enter housing (72).
E. Remove brake tube (79) from the gear housing and
discard O-rings (80). Remove the motor shaft and
3. Mark the location of spring cover (77) with respect to
O-ring (8). Discard the O-ring.
housing (72), and the location of the motor assembly with
respect to spring cover (77). This will ensure that the motor
F. Remove brake piston (27) from shaft end cover (24).
ports and vent port are located correctly when reassembling
Remove end discard O-rings (25) and (28), and back-
the unit.
up washers (26) and (29). Remove brake pins (23)
only if replacement is required because of damage or
4. Loosen each capscrew (75) one-half turn at a time, until
wear.
the pressure of brake spring, (73) on the spring cover has
G. Turn port end cover (19) and shaft end cover (24)
been released, and remove the cover.
over to that thrust plates (17) are up. Pry off the
thrust plates with a knife blade or thin screwdriver,
taking care not to mark the face next to the end
covers. Remove and discard pocket seals (1) and (2).
Care must be used to ensure that the spring cover
H. Pull bearings (3) with a bearing puller from the end
screws are removed evenly, as the cover carries the
covers, only if they are to be replaced. Remove and
full load of the brake springs.
discard O-rings (9) and backup washers (10) from
bushings (15) and (22).
5. Mark the location of each brake spring prior to removing
the springs. Remove and discard O-rings (58) and (78).
NOTE
6. Remove snap ring (74). Lift the motor assembly and
brake piston out of the reducer housing. If it is necessary to
If bearings (3) have been removed, remove bushings
disassemble the motor assembly, proceed as follows:
(15) and (22). Then remove and discard O-rings (11)
and backup washers (12). If bearings (3) are not being
NOTE
replaced, it is unlikely that bushings (15) and (22)
will require replacement.
It is recommended, if the motor assembly is found to
be faulty, that it be returned to the factory for a new
7. Brake hub assembly (33) may have been removed with
or reconditioned unit. Be sure to have on hand new
the motor assembly in Step 6. If not, remove the brake hub
O-rings, backup washers, and pocket seals before
starting to disassemble the unit. It is important to
assembly from the bore of the primary planet hub. Remove
snap rings (70) and brake ring (69) from brake hub assem-
install new O-rings and pocket seals once the old parts,
bly (33). Remove brake plate (68).
have been disturbed, to prevent Ieakage.
6B-4
