Specifications

GOLDCUP CONTROLS SERIES 900
TEST
36. Install four orifices (52), two each in two tapped holes in stroker block (54) closest
to the proportional valve.
37. Install proportional pressure valves (53) in block (54). Torque to 20 lb.-ft. (27 Nm).
38. Install coils (64) on proportional valves (53). CAUTION! Torque to 20-25 in.-lb.
(2.2-2.8 Nm) MAX.
39. Install remaining parts.
40. If control is to be tested on pump, install on pump control pad with O-rings (3), (5)
and (57), gasket (19), washers (61), and screws (2). Torque to 30 lb. ft. (40.8 Nm).
Install bypass check valves fittings, and lines.
Remove plug over input shaft. Insert T handle 3/16” (4.76mm) hex wrench into open-
ing
Connect proportional control driver to proportional valves electrical connection.
Install a needle valve on the bypass valve exhaust port, connected to tank. Close the
valve.
Install a 500 psi (35 Bar) gage in the brake port.
Rotate the T handle to check for free play. Turn spring adjustment in or out till there is
no free play. Lock in place. Note: this adjustment is critical to accurate neutral
adjustment!
1. Start prime mover and adjust system relief valve for 5000 psi (345 bar).
2. Turn centering trimmer screw to place input shaft on the zero stroke position.
Stroke pump to full and release, on both sides of center. Pump shall return to zero
stroke within 200 psi (13.8 bar) max.
3. 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.
4. Set max. volume stops so that servo shaft link touches stop pins when T handle is
rotated each side of center. Caution! Do not exceed 100 in. lb. (11.3 Nm) torque.
Lock in place.
5. Apply signal current to one proportional valve. Adjust current from minimum to
maximum. Note the pressure and current value at which pump just starts to stroke,
and at which the pump reaches full stroke These must be within the following values:
6. If control pressure is off the same amount at start and end of stroke, the control
may be disassembled and the spring (Figure 2) readjusted. One flat (1/6 turn) of
adjustment will change the pressure by 4.6 psi (0.31 bar).
7. If the change in pressure from start to end of stroke is incorrect, the spring (Figure
2) is incorrect and must be replaced.
8. If pressures are correct but current is incorrect, then either the coil is incorrect or
the proportional valve is bad.
9. With minimum signal, pump shall return to zero stroke within 200 psi. (13.8 bar)
max.
10. Repeat test on opposite side of center.
11. Increase and decrease current between minimum and maximum 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 stroke up
to approximately 50% stroke from zero stroke, then adjust down from full stroke to the
same current value. The flow at the two settings shall not vary more than 25%.
12. Stroke pump control one side of center. 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
system pressure drops to 2000 psi (138 bar), on decreasing signal. Repeat by
stroking control other side of center. Record both pressures for each side of center.
13. 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
96
Coil Cont. Pr. Ma. Min. Cont. Pr. Ma
Min. Disp. Disp. Max. Disp. Max. Disp.
12 Volt 75 ±15psi 360 ± 60 250±25psi 650 ± 110
(5.17±1bar) (17.2±1.7bar)
24 Volt 75±15psi 180 ± 30 250±25psi 325 ± 55
(5.17±1bar) (17.2±1.7bar)