Sharp WQ-700H Specifications Page 14

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GOLDCUP CONTROLS SERIES 200
CODE 2H 3 POSITION
CYLINDER CONTROL
S23-12358
DESCRIPTION
DISASSEMBLY
See Figure 2H
PREPARATION FOR ASSEMBLY
REWORK OF WEAR PARTS
ASSEMBLY
Code 2H cross center pump controls are spring centered and can be piloted to full
displacement either side of center by introducing a pilot pressure into the control ports.
A trimmer adjustment provides for accurate setting of zero stroke position. Maximum
displacements are adjustable from zero to full stroke.
When there is no control signal, displacement may be manually controlled between
these two limits with a lever attached to the input shaft.
1. Remove screws (17). Remove control from pump. Examine servo plate for exces-
sive scratching. Note if orifices in stem are open. If servo plate is scratched or orifices
appear to be plugged, remove plate and servo stem by removing two socket set
screws from plate, then alternately loosening the two button head screws under the set
screws.
2. Remove retaining ring (4) and press the shaft assembly through the valve body.
3. Examine shoes (8) and (25) for contamination in balance pads or excessive
scratching on faces. Note: the two shoes are not identical and must be installed in the
proper position on reassembly.
4. Remove the plug (29) with attached parts. Remove the spools (27).
5. Remove plugs (22). Remove springs (20) and spools (18). Examine spools and
bores for free motion, wear or contamination.
6. If trimmer adjustment must be removed, carefully tap the spring pin (14) in till flush
with O.D. of screw (13). Remove nut (15), and screw (14). Remove spring pin from
screw.
All parts are to be inspected and be free of material defects, dirt, scratches or any for-
eign material.
All parts are to be cleaned with a suitable cleaning solvent and all cores and passages
blown out with clean dry compressed air.
After cleaning and inspection, all parts are to be covered with a light film of oil and
should be protected from dirt and excessive handling until assembled onto the unit.
During assembly, lapped and ground surfaces should be kept lubricated and protected
from nicks or surface damage.
1. Apply pipe sealant and Install plug (10) in body. Torque to 100 lbs-in. (11.3 Nm)
2. Press rollpins (23) into body, being careful not to mar the surface in the area of the
shoe path.
3. Press pin (12) into screw (13) to 0.38” (9.65 mm) extended length.
4. Install screw (13) into body Pin (12) should extend into spool bore approximately
.090” (2.29 mm). The eccentric pin must be indexed so that it is offset towards the out-
side surface of the cover plate. The drilled hole for the spring pin (14) should be
approximately centered in the slotted opening in the cover plate. Install spring pin (14)
into trimmer assembly. Leave approximately one-half length of pin extending from
screw. This will allow approximately plus or minus 45° rotation of the trimmer assem-
bly. Install nut (15), O-ring (16), plug (32) and O-ring (31).
5. Install O-ring in groove of shear seal (8). Install shear seal with O-ring in the large
hole on the servo link, on the servo shaft side. Be certain that the shear seal is sitting
with the flange flush against the servo link surface.
6. Install thrust washers (9) over servo shaft and seat against the servo link.
7. Install O-ring (5) in the second groove from the end of the shaft, using installation
tool T-1.
14
Description Rework
Servo plate face Fine stone to remove raised burrs & dings
Shear seal Fine stone to remove raised burrs & dings. Note:
grooves to supply balance pads must be present
and adequate.
Control cover Stone or lap inside face to remove raised burrs &
dings.
Spool Break sharp edges or dings.
Note: The shear seal will fit in one position only. Otherwise one side will be held up
by the lip of the servo link. Shear seal (8) must be installed to face against the cover
plate (11). This shear seal differs from shear seal (25) in that the face surface is ma-
chined with two .094” (2.4 mm) radius scallops.
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