Specifications

GOLDCUP CONTROLS SERIES 600
CODE 6A - HYDRAULIC
STROKER/ADJUSTABLE STOPS
PUMP
S23-12289
Feature 00, CW -A Mtg, CCW - B Mtg.
S23-12290
Feature 00, CW -B Mtg, CCW - A Mtg.
S23-12291
Feature 01, CW -A Mtg, CCW -B Mtg.
S23-12292
Feature 01, CW -B Mtg, CCW -A Mtg.
MOTOR
S23-12304 Feature 0*, B Mtg
S23-12305 Feature 1*, A Mtg
S23-12293 Feature 1*, B Mtg.
S23-12306 Feature 2*, A Mtg.
S23-12295 Feature 3*, A Mtg.
DESCRIPTION
DISASSEMBLY
See Figure 6A
ASSEMBLY
See Figure 6A-1
REWORK OF WEAR PARTS
This one side of center control is used on both pumps and motors. It contains a spring
biased spool in the control cover that is operated by the signal port. This positions the
rotary servo proportionally to pilot or control pressure. With no external control pres-
sure and the centering spring properly adjusted, the stroking piston will position the
rotary servo at the zero stroke position for pumps, and for motors at the full stroke
position. With full signal, the stroking piston will position the rotary servo at full posi-
tion for pumps, and for motors at 1/3 stroke position. Minimum and maximum stops
are fully adjustable.
1. Remove screws (10). Remove control from unit. Examine servo plate for excessive
scratching. Note if orifices in stem are open. If servo plate is scratched or orifices ap-
pear 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 screws (24) and remove the centering adjusting group intact. Do not dis-
assemble or change unless parts are damaged or setting is incorrect.
3. Remove screws (29) and cover (28) with assembled parts.
4. Remove screws (22) and remove cover (21). Loosen screw (4).
5. Remove servo shaft assembly. Remove clamp (8).
6. Examine shoes on servo shaft assembly 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.
7. Remove spool (12). Do not remove stroker body from valve cover unless seals
need replaced.
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 to the 1/8" pipe plug (12) and install in the cover plate (9).
Torque to 100 lbs-in. (11.3 Nm).
2. Install O-ring (1-8) in groove of shear seal (1-5). 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.
49
Part 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.