Specifications
GOLDCUP CONTROLS SERIES 600
TEST
PUMP CONTROL PRESSURE
23. Repeat steps 19 thru 22 on other end.
24. Install cover (23) with cover screws (24) and O-ring (27). Torque screws to 14 lbs-
ft. (19 Nm).
25. Place two spring washers (25-6), nested with the bent sections matching each
other, into the large hole in the servo link (25-3).
26. Place washer (25-10) against the spring washers.
27. Install O-ring (25-8) into groove in the remaining shear seal (25-7). Note: This
shear seal does not contain the two .094 radius scallops in the face. Place on top of
washer, (25-10). Position shear seal to match the lip on the servo link.
28. If control is to be tested on pump, install on pump control pad with gasket (51), ref
Fig. 6B-1, 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 ports on hydraulic stro-
ker through a 4-way valve. Center position must dump both ports to tank at min. pres-
sure.
Install a needle valve on the bypass valve exhaust port, connected to tank. Close the
valve.
1. To set pump centering, remove plugs from ends of centering groups. Alternately
adjust screws by backing out on one slightly and turning in on the opposite screw the
same amount, (till it just contacts the spool), observing pump flow and pressure till
minimum flow and pressure are obtained and there is no backlash. Stroke pump to full
and release, on both sides of center. Pump shall return to zero stroke within 200 psi
(13.8 bar) max.
2. Apply servo pressure to one port of stroker. Adjust pressure from minimum to max-
imum. 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, control may be disassembled and washers added or deleted
in the spring box on the opposite end. Each washer (17) added (or removed) increas-
es (or decreases) control pressure approximately 10 psi for 00, 02 and 03 control fea-
tures, and 12 psi for the 01 control feature.
3. With minimum signal, pump shall return to zero stroke within 200 psi (13.8 bar)
max.
4. Repeat test on opposite side of center.
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 50% 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. Load the pump. Stroke pump CW. The gage on the brake port should start to indi-
cate 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. Repeat by rotating
input shaft CCW. Record both pressures for each rotation of the servo input shaft.
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.
56
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)