Specifications

GOLDCUP CONTROLS SECONDARY CONTROL
STROKE INDICATOR
S13-42064
DESCRIPTION
DISASSEMBLY
REWORK OF WEAR PARTS
PREPARATION FOR ASSEMBLY
ASSEMBLY
The output stroke indicator mounts on the opposite side from the input control on the
pump or motor housing. The assembly contains the shoes and servo arm and shaft
arrangement of the input controls. The servo arm couples to the pump cam. An indi-
cator attached to the shaft thus indicates the cam position. Servo oil is fed to the
shoes to balance the side force on the cam resulting from the shoes on the opposite
side.
1. Remove screws (2). Remove cover from pump.
2. Remove indicator (12). Remove retaining ring (4) and press the shaft assembly
through the valve body.
3. Examine shoes (8) and (14) 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.
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 in.-lb. (11.3 N•m)
2. Install O-ring (7) 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.
3. Install three thrust washers (9) over servo shaft and seat against the servo link.
4. Install O-ring (5) in the second groove from the end of the shaft, using installation
tool T-1.
5. Install the servo shaft assembly into the cover plate (11).
6. Install retaining ring (4) into the groove of the servo shaft extending through the
cover plate.
7. Place two spring washers (13), nested with the bent sections matching each other,
into the large hole in the servo link.
8. Place washer (19) against the spring washers.
9. Install O-ring (7) into groove in the remaining shear seal (14). Note: This shear
seal does not contain the two .094” (2.4 mm) radius scallops in the face. Place on top
of washer (19). Position shear seal to match the lip on the servo link.
10. Place servo link against a solid object and press indicator (12) on the servo shaft
end. Align the pointer line on the indicator with the scribed line across the shaft.
When the pointer is towards the letter “O”, the link should be centered between the
dowel pin holes on the control cover. Install screw (17).
11. To mount on unit, slip servo arm between the two spacers extending from the
servo stem and align control with housing dowels. Install control on pump with screws
(2), new Nyltite washers (6), and gasket (15). Torque screws to 30 ft.-lb. (40.8 N•m).
108
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.
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 (14) in that the face surface is ma-
chined with two .094” (2.4 mm) radius scallops.