Care should be exercised when removing the PTO from subdrive assembly so that the facings
and pilot bearing are not damaged.
Attach a lifting device to the PTO assembly (8) and remove screws (10) and lockwashers (11). Lift PTO
assembly out and away from subdrive assembly. Refer to paragraph 4-6.2 for maintenance of PTO.
Close all valves at outlets from hydraulic tank. Place a container beneath hydraulic hose connections to pumps
on subdrive. Disconnect all hydraulic lines.
The hoses should be tagged in some way to aid in locating them properly at assembly.
Remove screws (12 and 15) and lockwashers (13 and 16) to remove pumps (14 and 17). Refer to paragraph 4-
6.4 for maintenance of pump.
Remove screws (18) and lockwashers (19) to remove pump (20). Refer to paragraph 4-6.3 for maintenance of
Remove screws (21) and lockwashers (22) to remove displacement pump (23). Refer to paragraph 4-6.5 for
maintenance of pump.
Disconnect driveshaft (26) by removing screws (24) and lockwashers (25). Swing driveshaft (26) away from
flange. Disconnect lower driveshaft (29) by removing screws (27) and lockwashers (28). Lower driveshaft (29)
clear of subdrive.
Through the access hole in the clutch housing (30), disconnect the air lines from the air compressor drive clutch
(31). Remove screws (32) and lockwashers (33) attaching clutch housing to subdrive case.
Remove the hardware that attaches the air compressor (34) to the drill frame. Move the air compressor, with
clutch housing, away from the subdrive assembly far enough to give access to the clutch (32).
Remove the screw (35), lockwasher (36) and washer (37). Remove the clutch (31) from the shaft of the
subdrive. Refer to paragraph 4-7.2 for maintenance of the clutch.
Remove screws (38) and lockwashers (39). Attach a hoisting device to the subdrive assembly (40) and lift it
from the drill frame. Set the subdrive on a stand that will support it in the upright position. Drain the lubricant
from the case.
4-6.1.2 Disassembly. (Figure 4-10)
Remove screws (1), lockwashers (2) and plate (3) with filler cap (4). Note the position of filler cap in relation to
the case so that it will be properly oriented at assembly. Remove gasket (5).