Specifications

GOLDCUP CONTROLS SERIES 500
See Figure 5-C
TEST
screw. This will allow approximately plus or minus 45° rotation of the trimmer assem-
bly. Install nut (18) with O-ring (19), locking trimmer in position. Install O-ring (52) and
plug (53).
5. Assemble seat insert (20) and threaded insert (21) into spools (22), using loctite
#271 per instructions on bottle. Inserts must be assembled into the spool end nearest
the 1/8” (3.18 mm) cross drilled holes.
6. When assembled spools (22) are installed in cover plate (12), they are held against
the eccentric pin of the trimmer assembly by springs (27). In this position, adjusting
screw (24) must have the ball (23) unseated by .012” (.305 mm) to cause brake re-
lease at 5% of stroke. A special fixture permits adjustment to this setting per AP-
01925. In the absence of this fixture, drop ball (23) into the spool containing the seat
insert. Hold the ball against the seat by inserting piston (26) into the bore. Hold the
two spools (22) with inserts together and set the adjusting screw (24) to where it just
contacts the ball. Turn the adjusting screw in 8 3/8 turns past this point and lock with
setscrew (25), being careful not to disturb the setting.
7. Retain ball (23) in spool bore by installing spring pin (17). Make sure that the ends
of the spring pin do not extend beyond the O.D. of the spool.
8. Install pistons (26) into the spools (22). Install spool assemblies in the bore con-
taining the trimmer adjustment. The spool containing the ball is to be on the side with
the orifice (11).
9. Install springs (27) over pistons. Install plugs (28) and O-rings (29).
10. Install spools (30) and (33) into the other cross-bore in the cover (12). Spool (30)
should be on the side with the orifice (11), and with the slotted side to the outside.
11. Install spring (31) and plug (32) with O-ring (29) on this side.
12. Install O-rings (37) on fitting (38). Install piston (39) in bore of body (36). Install
fitting (38) on body (36) and install assembly in cover (12).
13. Install O-rings (41) and (42) on vent post (43). Install vent post in cover. Install
spring (44) and shoe (45) on vent post.
14. Place two spring washers (31-6), nested with the bent sections matching each
other, into the large hole in the servo link.
15. Place washer (31-4) against the spring washers.
16. Install O-ring (31-8) into groove in the remaining shear seal (31-7). Place on top
of washer (31-4). Position shear seal to match the lip on the servo link.
17. Install control on pump over dowels, with gasket, washers (36) and screws (35).
Torque to 30 lbs-ft. (40.8 Nm).
18. Install bypass tubing lines.
Install a needle valve on the bypass valve exhaust port, connected to tank. Close the
valve. Install a 1000 psi (70 bar) gage in the brake port.
1. With servo pressure applied, bleed air from force motor by loosening the screws
holding the electrical connector to the cap. If force motor faces down, bleed air from
the stroke limiting screws. Command stroker back and forth to assure that all air is
purged from the stroke piston, and stroker is functioning properly.
2. Load pump. Set compensator to 1000 psi. Shut off external servo supply to control.
3. If system contains a shuttle valve, disable the shuttle valve as follows:. If shuttle is
on the pump, turn the shuttle relief adjustment two turns in. If it is a Denison shuttle
mounted on the motor, remove shuttle and plug the two threaded ports with 3/8-24
setscrews. Re-install the valve.
4. Adjust and lock the trimmer for minimum system pressure on both ports. Connect a
handle to the .375” (9.52 mm) dia. shaft extension on the stroker. Stroke the pump
both sides of center. Do not exceed 100 lbs-in. (11.3 Nm) torque. Observe pressures
on system ports. Continue adjustment till pressure on either side is less than 150 psi
difference.
5. Disconnect electrical signal and open servo oil supply to stroker. (200 psi min,
1000 psi max.) (14 bar min. 69 bar max.).
6. For controls with deadband (Feature 00), rotate the jet pipe null adjustment CCW
and CW to develop 700 psi (48 bar) on each system port. Caution: always begin
adjustment by backing out (CCW) on the jet pipe null adjustment and observing
control reaction. Overadjusting clockwise direction can damage the jet pipe or
the trimmer spring. Set the screw midway between these two limits and lock. Torque
to 10 lbs-in. (1.1 Nm) max. Install O-ring and cover nut.
7. For controls with no deadband, set and lock the jet pipe null adjustment at the
point of minimum system pressure on both ports with pump at operating temperature.
8. Reconnect electrical signal and zero the electrical driver “zero adjustment” for mini-
mum pressure.
9. Unload pump. Stroke to full displacement. Turn in maximum stroke stop till pump
just commences reducing stroke. Lock in this position. Repeat with current of oppo-
site polarity
10. For controls with the 00 feature (deadband): Slowly apply current to the valve.
Note the value of current at which pressure starts to build (e.g. +40MA). Back off cur
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