ac.
Lubricate o-rings (13) and install check valves (12) and o-rings (13). Use caution to prevent damage to the o-
rings. Be certain the valves (12) are below the surface of the end cap (25). Torque to 30-40 ft-lbs.
ad.
When replacing the charge pump (10), align the gasket (11) so that the small relief valve port is open and not
blocked by the gasket. Rotate the charge pump shaft so it aligns approximately with the slot in the end of the
pump drive shaft. Hold the idler spacer in place and install the charge pump onto the end cap (25). Rotate the
charge pump until the tang and slot engage and the pump is solidly on the end cap. As the charge pump is
installed make sure the alignment roll pin is engaged in the charge pump and pump end cap.
ae.
Install the four hex, cap screws (8) and washers (9) and tighten to 10-11 ft-lbs.
4-6.6. Driveshafts. (Figure 4-19A). The primary maintenance to be performed on the universal joints and driveshafts is
lubrication of the grease fittings. Parts that are most susceptible to wear are in the universal joints. Repair parts to
overhaul a universal joint and driveshaft are furnished in repair kits. The following procedures are adequate to repair any
of the universal joints and driveshafts installed on the drilling machine.
WARNING
Rotating shafts can be dangerous. You can snag clothes, skin, hair, hands, etc. This can
cause serious injury or death. Do not work on a shaft with engine running .
4-6.6.1 Removal. Remove the mounting screws connecting the flange yokes (1) to the driving and driven components.
4-6.6.2 Disassembly.
a.
Using a soft drift, tap the outside of the bearing assembly (3) to loosen snap ring (2). Tap bearing only hard
enough to break assembly away from snap ring.
b.
Remove snap ring (2) from yoke (1). Turn joint over and remove opposite snap ring.
c.
Set the yoke (4) in an arbor press with a piece of tube stock beneath it. Position the yoke with the lube fitting
pointing up to prevent interference during disassembly. Place a solid plug on the upper bearing assembly (3)
and press it through to release the lower bearing assembly.
d.
If the bearing assembly (3) will not pull out by hand after pressing, tap the base of the lug near the bearing
assembly to dislodge it.
e.
To remove the opposite bearing assembly, turn the yoke (1) over and straighten the cross (5) in the open cross
hole. Then carefully press on the end of the cross so the remaining bearing assembly (3) moves straight out of
the bearing cross hole. If the cross or bearing assembly are cocked, the bearing assembly will score the walls of
the cross hole and ruin the yoke.
4-80
