Specifications

GOLDCUP CONTROLS SERIES 600
TEST
20.. Install O-ring (20) in cover (28) and mount on housing on opposite side from cen-
tering assembly, with screws (29). Torque screws to 14 lbs-ft. (19 Nm).
21 Install setscrew (30) in cover (28) till it contacts spool (12). Install nut (31), O-ring
(32), plug (27) and O-ring (26) on setscrew and lock.
22. Install cover (21), cover screws (22) and O-ring (25). Torque screws to 14 lbs-ft.
(19 Nm).
23. Place two spring washers (23-6), nested with the bent sections matching each
other, into the large hole in the servo link,
24. Place washer (23-10) against the spring washers.
25. Install O-ring (23-8) into groove in the remaining shear seal (23-7). Note: This
shear seal does not contain the two .094 radius scallops in the face. Place on top of
washer, (23-10). Position shear seal to match the lip on the servo link.
26. If control is to be tested on pump, install on pump control pad with gasket (ref Fig.
6B-1 item 51), nyltite washers (12), and screws (10). Torque to 30 lb. ft. (40.8 Nm).
Install bypass check valves fittings, and lines.
Connect servo source, adjustable to 450 psi (31 bar), to control port on hydraulic stro-
ker.
Install a needle valve on the bypass valve exhaust port, connected to tank. Close the
valve.
1. Set pump to zero stroke by adjusting minimum stop screw (30).
2. Apply servo pressure to signal port of stroker. Adjust pressure from minimum to
maximum. Note the pressure at which pump just starts to stroke, and the pressure at
which the pump reaches full stroke These pressures must be within the following val-
ues:
If pressures are incorrect, turn adjusting screw (18) to obtain correct pressure.
3. With minimum signal, pump shall return to zero stroke within 200 psi (13.8 bar)
max. system pressure.
4. With full control signal pressure on control port, set screw (19) for full stroke, Lock
adjustments and install acorn nut (16).
5. Increase and decrease control pressure between 0 and 450 psi (31 bar) several
times . Pump stroke should follow control pressure smoothly and proportionally. Full
to zero or zero to full stroke should be achieved in no more than two seconds. Adjust
control pressure up to 90% stroke from zero stroke, then adjust down from full stroke
to the same value. The control pressure at the two settings shall not vary more than
50 psi (3.4 bar) from each other.
6. With pump on zero stroke, turn brake trimmer screw CW and CCW while observing
gage on brake port. Note the positions where the gage reading changes from case
pressure to servo pressure to case pressure. Set and lock the adjustment midway be-
tween these two positions.
7. Place load on pump and stroke pump. The gage on the brake port should start to
indicate servo pressure when the system pressure is between 2000 and 4500 psi (138
and 310 bar), with an increasing signal, and must return to case pressure before sys-
tem pressure drops to 2000 psi (138 bar), on decreasing signal. Record both pres-
sures.
8. Open the needle valve on the neutral bypass port. Measure and record leakage
from this port with the pump on center at minimum psi, and with the pump off center,
at 5000 psi.
Maximum leakage with control on center:
63
Pump rot. & cont. mtg Centering group location
CW — A See Fig. 6C
CW - B Opposite to Fig. 6C
CCW - A Opposite to Fig. 6C
CCW - B See Fig. 6C
Control Pressure Pressure
Feature Start Full
00 75± 15 psi 335± 25 psi
(5.2± 1 bar) (23.1±1.7 bar)
01 75± 15 psi 435± 25 psi
(5.2± 1 bar) (30± 1.7 bar)
02 100± 15 psi 375± 25 psi
(6.9± 1 bar) (25.9± 1.7 bar)
03 150±15 psi 400± 25 psi
(10.3±1 bar) (27.6± 1.7 bar)