Specifications

GOLDCUP CONTROLS SERIES 900
9C ELECTRIC STROKER WITH
BRAKE AND BYPASS VALVE
S23-12925 - A/B - 00 Pump (Cross
ctr. 24V)
DESCRIPTION
DISASSEMBLY
See Figure 9C
REWORK OF WEAR PARTS
ASSEMBLY
See Figure 9C
The 9C is basically an 8C package with the addition of two electric proportional pres-
sure control valves mounted in a manifold block, thus proportionally controlling pump
stroke by means of an electrical signal, while incorporating a brake and bypass valve
function in the package. The Jupiter 900 Driver Card has been developed to ac-
company the 9C control with 24V coil.
Refer to 8C and 8A for brake and stroker description.
1. Disconnect connector (58) from coil (64).
2. Remove proportional valves from block (53). Do not attempt disassembly of the
valve, other than replacement of the coil, (64) and external O-rings, (53-a), (53-b) and
(53-c).
3. Remove screws (2) from control. Remove proportional valve block (54) from control.
Remove control from pump.
4. Examine servo plate for excessive scratching on surface. 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 soc. setscrews from plate, then alternately loosening
the two button hd. screws under the setscrews.
5. Remove retaining ring (4) and press the shaft assembly through the valve body.
6. Examine shoes (8) and (18) for contamination in balance pads and excessive
scratching on shoe faces. Note the two shoes are not identical and must be installed
in the proper position upon reassembly.
7. Remove the brake trimmer stop assembly (13) intact.
8. Remove the center trimmer screw (23) with the spool assembly and stop assembly
intact. Note: signal pressure setting is determined by the spring preload. Do not dis-
assemble or change unless setting is incorrect.
9. Remove tubing assembly (74). Remove bypass valve body (42) with fitting (44) and
piston (45). Remove elbow (73) with orifice (37) and fitting (38). Remove spools (31)
and (39).
10. Remove shoe (50), and spring (49).
11. Examine orifices (16) and (29) in body for contamination. Examine passages in
body for free flow.
12. Clean and examine all parts for breakage or evidence of abnormal wear.
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. Install .031” orifices (29), checking to see that they clear the bore. Install the .018”
orifice (16) in body.
2. Apply pipe sealant and install 1/16 pipe plugs (28) in body as shown. Torque to 25
lbs-in.. (2.8 Nm)
3. Apply pipe sealant to the 1/8” pipe plugs (12) and install in the cover plate. Torque
to 100 lbs-in.. (11.3 Nm)
4. Thread trimmer locknut (22) all the way onto center trimmer screw (23). Slip back-
up washer (21), small dia. first, onto trimmer screw and against locknut. Using a 3/4-
16 hex nut, with a 1.030” (26.2mm) dia. x .030/.035” (0.76/0.89mm) deep c’bore, crimp
the washer onto the stop. Washer must be free to rotate slightly. Remove crimping
nut.
94
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.
Shoe Stone to remove raised burrs or dings.