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Lift stem nut (2) out of the A drive housing and remove upper and lower thrust races and bearings
(03/04)
Machine the A drive stem nut according to valve stem requirements.
o
Drill and bore stem nut and cut thread. When fixing in the chuck, make sure stem nut
runs true!
Clean the machined stem nut.
After machining, re-install the A drive stem nut and bearings/races in the following order from the
housing up:
o
Race-bearing-race
o
Stem nut
Note: dog slots facing up!
o
Race-bearing-race
Reinstall the threaded locking ring and tighten clockwise until stem nut is difficult to turn.
Rotate the locking ring approximately ¼ turn counterclockwise and tighten the set screw.
Note: the stem nut should rotate freely!
Re-install the A drive assembly onto the GK by aligning the dogs of the GK with the stem nut and
install the four fasteners. Tighten the fasteners in a crosswise fashion to the correct torque
Press a good quality Lithium soap EP multi-purpose grease into the grease nipple with a grease gun.
Approximate capacity 1.5 oz.
4.2 ABG.2 -The output drive is removed through the top of the ABG
bevel gearbox
Refer to figure 3
Remove the stem cover cap (1) or the stem protection tube if installed.
Loosen and remove the two threaded locking rings (2/3) installed above the stem nut in the
hollow shaft of the bevel gearbox.
Lift the stem nut (4) up or push from the bottom until the stem nut is out of the hollow shaft area of
the ABG bevel gearbox.
Machine the ABG stem nut according to valve stem requirements.
o
Note: Do not damage the external splines on the stem nut.
o
Drill and bore stem nut and cut thread. When fixing in the chuck,
make sure the stem nut runs true!
Clean the machined stem nut.
After machining, re-install the ABG stem nut (4) through the top of the
gearbox while aligning splines, push stem nut completely down into hollow
shaft area.
Install and tighten the first threaded locking ring (2), notch up.
Install and tighten the second threaded locking ring (3), notch up.
Reinstall the stem cover cap (1). If installing a stem protection please refer to the
next section.
Figure 4
Figure 3
