TRUCK SERVICE MANUAL
from gear and plug lower most port to minimize loss
of fluid. Install special fitting (or combination of
fittings) in other port to allow connection to shop air.
Remove dirt seal (4) and retaining ring (5). Clean
dirt and paint from input shaft using fine emergy
paper if necessary. Place a shop rag over input shaft
area of gear and connect shop air to special fitting.
Air pressure should cause seal assembly items (7)
and (8), back-up washer (6) and some fluid to come
out of gear. Be sure shop rag is in place and be
prepared to disconnect air as soon as the seal
assembly is out of the cavity.
Apply clean grease to O.D. and I.D. of seal and to
input shaft. Install seal assembly (items 7 and 8)
and back-up washer with flat side of seal assembly
out. Press against back-up washer with soft (brass)
probe until back-up washer is just inside retaining
ring groove. Install retaining ring taking care that it is
properly seated in groove. Pack cavity above
retaining ring with grease and install dirt seal. Add
fluid to reservoir and bleed system if necessary.
Other parts of the gear which may be serviceable on
the vehicle are the end cover (37) and the valve
housing (9) areas. Familiarity with the gear should
be gained by bench disassembly and reassembly
before attempting to service these areas. The
portion of the gear to be disassembled should always
be cleaned so that dirt is not introduced into the gear.
Also, whenever the end cover or valve housing is
removed for service, care must be taken to position
the worm thrust bearing package (items 11, 12 and
11) properly upon reassembly. Anytime the end
cover is removed, the worm adjusting screw should
be backed out to avoid jamming of components
when end cover is reassembled.
Always check fluid level in the reservoir after
servicing the gear. If a significant amount of fluid is
added, the system should be bled.
FILLING AND AIR BLEEDING THE SYSTEM
1. Fill reservoir nearly full. Be ready to add oil when
engine is started. Do not let oil drop below outlet to
power pump, to insure that power pump will not suck
air into system.
2. Start engine, and let idle. Immediately add oil to
reservoir as needed to keep reservoir full.
3. Steer vehicle from full right turn to full left turn
several times. Poppets (34) must be adjusted so
they relieve pressure at full right and full left turns in
order to remove air from system. This procedure
should remove all air from system unless steering
gear is invert mounted.
4. To remove air from inverted mounted steering gears,
see steps 1, 2 and 3, then determine which direction
of steering wheel rotation is required to pressurize
bleed screw (20A). Turn steering wheel slowly in this
direction and loosen bleed screw a few turns. When
all air is removed from system, tighten bleed screw
3.4 + .33 N·m (30 + 3 in.lbs.).
If bleed screw (20A) is not tight when steering gear is
rotated in opposite direction, air will be sucked into
For type of lubricant refer to LUBRICATION CTS-
CTS-2717 Page 16
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