National Crane Published 10-30-2014 Control # 040-09 5-49
1400H OPERATOR AND SERVICE MANUAL SERVICE
SWING DRIVE SERVICE
Lubrication and Maintenance
Manufacturer recommends changing oil after first 50 hours
of operation. Oil should be changed at 500-hour intervals
thereafter. All gearboxes require GL-5 grade EP 80/90 gear
oil for lubrication. Some units may be equipped with a grease
fitting for lubrication of the output shaft bearings (pinion up
applications). The shaft bearings should be greased
sparingly at every 50 operating hours with a lithium or GP
bearing lube. In pinion down applications, gearbox oil will
lubricate Shaft bearings.
Oil Capacities:
70 oz (9,64 kg)
Disassembly Procedure
1. Remove drive from vehicle and drain gearbox lubricant
by removing the drain plug (31).
2. Remove the motor from the motor adapter (30).
3. Remove the brake assembly from the gear housing
assembly (7) by removing eight sockethead capscrews
(18).
NOTE: Notice the position of the brake port in conjunction
with the drain and fill holes in the housing for
reassembly.
4. Separate the motor adapter (30) from the brake housing
(15) by removing eight capscrews (32).
NOTE: Notice the position of the motor mounting hole in
relation to the brake release port for re-assembly.
The motor adapter is spring-loaded and the
capscrews should be loosened in a sequence that will
allow an even load distribution on the motor adapter.
5. Inspect the motor adapter O-ring (29) for damage.
Replace if necessary.
6. Remove the six springs (33), piston (25), and brake
driver (27) from brake housing (15).
NOTE: Notice the position of the dowel-pin hole in piston
with respect to the brake release port for re-
assembly.
NOTE: A port-a-power can be used to assist in the removal
of piston by slowly pressurizing the brake release
port until piston clears the top of housing (15).
Remove stator plates (19) and friction discs (20)
from the brake housing (15). Inspect stator plates
for excessive grooving or burn spots. Also, inspect
friction discs for wear. Replace as required. (Ref.
Fig. 1)
7. Remove stator plates (19) and friction discs (20) from
the brake housing (15). Inspect stator plates for
excessive grooving or burn spots. Also, inspect friction
discs for wear. Replace as required. (Ref. Fig 1).
FIGURE 6
8. Inspect the piston O-rings (22 & 23) and the back-up
rings (21 & 24) for damage, replace if necessary. (Ref.
Fig. 2)
FIGURE
7
9. If applicable remove 2nd piston (36) fro
m the brake
housing (15), inspect O-rings (37 & 38) and back-up
rings (39 & 40) for damage, replace if necessary. (Ref.
Fig. 2) Inspect bearing (41) in brake housing (15)
replace if necessary.
(in.) NEW
REPLACE IF
THICKNESS IS
BELOW 0.070 (in.)
FRICTION DISK
(WITHOUT WEAR)
0.080
0.085
O-RINGS
BACK-UP
RINGS
PISTON
O-RING
INSTALLATION
BACK-UP
RINGS
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