Remove check ball (29) and check ball retainer (30)
from the control housing. Remove O-ring seals (31) and
(32) from check ball seat (28). Inspect the O-ring seals
for wear or damage. Replace if necessary.
The following steps are for the assembly of the
metering pump (steering).
Be sure all parts of the steering control unit (SCU)
are clean and free of dirt and debris. Do not use a
cloth or paper towel to dry parts. Lint or other
material can get into the hydraulic system and
cause damage to components. Replace any parts
that have scratches or burn that could result in
leakage. Lubricate all moving parts with clean
hydraulic oil during assembly. Assemble with all
Install check ball retainer (30) in control housing (12).
Be sure the retainer is straight and not tilted in the bore.
Install check ball (29).
Put a thin coat of 1U-6396 Assembly Compound on O-
ring seals (31) and (32) and check ball seat (28). Install
the O-ring seals in their original location on the check
ball seat. Install the check ball seat in the center
housing, using an 1/8"-24 machine screw.
Install set screw (27), and tighten it to a torque of 11
Nm (100 lb-in). After installation, the set screw should
be slightly below the outside surface of the center
Put a thin coat of clean hydraulic oil on control spool
(19) and control housing sleeve (20). Install the control
spool in the control housing sleeve. The spool should
turn freely in the sleeve. Put the spring slots in each
component in alignment. Some spool and sleeve sets
may have alignment marks on them. In this case, align
the marks. Install centering spring kit (21). Be sure the
springs are centered. Install pin (18) that holds the
spool and sleeve together. The pin should be flush on
each side of the sleeve after installation.
When spool and sleeve assembly (11) is installed in the
control housing, be sure it is not tilted out of position. The
assembly should be pushed gently into place with a slight
rotating action, keeping pin (18) nearly horizontal. The
spool and sleeve assembly should be installed until it is
flush with the meter end of the housing (side with fourteen
holes in the end). Be sure pin (18) does not drop into the
discharge groove in the center housing. Be sure the spool
and sleeve assembly turns freely in the center housing.
Put the center hous ing in a vertical position. Install two
bearing races (16), needle thrust bearing (17),
O-ring seat (15), O-ring seal (14) and backup ring (13).
Assemble gland bushing (23). Install dust seal (24) in
seal gland bushing (25) with the flat or smooth side of
the seal facing the bushing. Turn the seal gland
bushing over. Install quad ring seal (26) in the seal
gland bushing. Smooth the seal in place with your
finger. Do not reuse a seal that falls freely into the
pocket in the bushing.
Install gland bushing (23) over the spool with a twisting
motion. Use a soft faced hammer to seat the gland
bushing against bearing race (16). Install retaining ring
(22). Be sure the retaining ring is properly seated.
Put the metering pump (steering) in a vertical position
with the steering column facing down. Install O-ring
seal (10) in control housing (12).
Install spacer plate (9). Be sure the bolt holes in the
spacer plate align with the tapped holes in the center
housing. Put pin (18) in a horizontal position in the
center housing. Install drive (8). Be sure the slot in
drive (8) engages with pin (18).
The metering pump (steering) must be timed, this requires
the correct relationship between pin (18), Gerotor (6) and
housing (4). One end of pin (18) will point to the largest
clearance between the Gerotor and Gerotor housing, the
other end of the pin points to the least clearance. Pin (18)
cannot be seen after drive (8) is installed, so it will be
necessary to make a mark on the gear end of the drive for