Specifications
GOLDCUP CONTROLS SERIES 900
See Figure 8C-1
See Figure 9C
See Figure 8C-2
See Figure 9C
5. Compress spring (4) solid in order to remove set. This may be safely accomplished
using a 1/4” (6.35 mm) dia. bolt, nut and washers.
6. Assemble retaining ring (2), guide (3), spring (4) and guide (9) onto spool (1).
7. Tighten nut (6) till it just starts to load the spring, then tighten 2 5/6 additional turns
8. Install locknut (5) onto spool and lock against nut (6) without changing adjustment.
9. Install spool (7) onto other end of spool assembly (1). Install nuts (8) and tighten till
spool has from .001 to .003” (.025 to .076 mm) clearance. (Barely free to rotate with-
out binding). Lock nuts together and re-check spool fit.
10. Insert spool assembly (11), spring end first, into center trimmer screw (23).
Compress snap ring on the spool assembly until it snaps into internal groove inside
trimmer screw. See that it is securely seated.
11. Thread spring stop locknut (24) all the way onto adjusting spring stop (25). Slip
back-up washer (26), small diameter first, onto stop and against locknut. Using a 9/16-
18 hex nut with a .810/.815” (20.6-20.7mm) dia. x .030-.035” (0.76-0.89mm) dp. c’bore,
crimp washer onto stop. Washer must be free to rotate slightly. Remove the crimping
nut.
12. Install O-ring (35) on plug (34) and insert into spring stop (25). Install O-ring (27)
onto stop (25) and against washer (26).
13. Thread spring adjustment stop (25) into trimmer screw (23) until it just touches the
spool assembly. Be sure spool assembly is against snap ring.
14. Place O-ring (14) on trimmer screw (23) and thread assembly into the larger
cross-bore in the cover plate. Install from the end which contains the 1/16” pipe plug.
15. Install nut (36) on adjusting screw (6). Thread adjusting screw into stop (25).
16. Thread locknut (8) all the way onto guide (1). Slip back-up washer (7), small dia.
first, onto guide 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.
17. Install stop (2) into guide. Install O-ring (9) on nut (3) and install over stop (2).
Install O-ring (10) over plug (11). Install plug in nut (3).
18. Install O-rings (4,5, and 6) on guide (1). Lubricate O-rings and carefully insert
guide into bore and over spool on opposite side from the trimmer screw.
19. Install spools (31) and (39) into the other cross-bore in the cover (10). The slotted
end of spool (31) should be to the outside.
20. Install O-ring (27) on plug (38). Install spring (37) in plug and install plug in cover
as shown.
21. Install O-rings (43) on fitting (44). Install piston (45) in bore of body (42). Install
O-ring (72) on plug (71) and install plug in body (42). Install seals (70) on body (42).
Install fitting (44) on body and install assembly in cover (10).
22. Install rollpins (30) in cover, being careful not to damage the cover surface.
23. Install O-rings (46) and (47) on vent post (48). Install vent post in cover.
24. Install spring (49) and shoe (50) over vent post.
25. Install 0-ring (7) in groove of shear seal (8).
26. Install shear seal with o-ring in 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.
27. Install thrust bearing (9) over servo shaft and seat against the servo link.
28. Slip washer (33) over the servo shaft and against the thrust bearing.
29. Using installation tool T-1, install O-ring (5) in the second groove from the end of
the shaft (1). Warm glyd ring (20) to make it pliable, and install over O-ring (5).
30. Install the servo shaft assembly in the cover plate (10). Pin must engage slot in
spool assembly (11).
31. Install retaining ring (4) into the groove of the servo shaft extending thru the cover
plate.
32. Apply Loctite 271 on threads of screw (55), and on threads of shaft assembly (1).
Assemble nut (56) on screw, insert screw into shaft assembly and turn in snugly.
Torque nut to 14 lb.-ft. (19 Nm).
33. Place two spring washers (17), nested with the bent sections matching each other,
into the large hole in the servo link.
34. Place washer (32) against the spring washers.
35. Install O-ring (7) into groove in the remaining shear seal (18). Note: This shear
seal does not contain the two .094 radius scallops in the face. Place on top of washer,
(32). Position shear seal to match the lip on the servo link.
95
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 (10). This shear seal (8) differs from shear seal (18) in that the face surface is
machined with two .094” (2.4mm) radius scallops.