Specifications

GOLDCUP CONTROLS SERIES 900
9A CONTROL TEST SETUP
9A PUMP TEST
9A MOTOR TEST
28. Place washer (32) against the spring washers.
29. Install O-ring (7) into groove in the remaining shear seal (18). Note: This shear
seal does not contain the two .094” (2.4mm) radius scallops in the face. Place on top
of washer, (32). Position shear seal to match the lip on the servo link.
30. Install four orifices (37) in two tapped holes in stroker block (39) closest to the
valve opening. Insert one orifice, then another on top of the first. Torque to 70 lbs-in.
(7.9 Nm).
31. Install proportional pressure valve(s) in block (39). Torque to 20 lb.-ft. (27 Nm).
Cross-center pumps use two valves. One side of center pumps and motors use one
valve. See chart for location of single valve:
32. For controls with single valve, install soc. setscrew (54) in the tapped hole furthest
in from the unused opening. Torque to 70 in.-lb. (7.9 Nm). Install plug (53) and O-ring
(55) in the unused opening. Torque to 20 lb.-ft. (27 Nm).
33. Install coil(s) (52) on proportional valve (38). CAUTION! Torque to 20-25 in.-lb.
(2.2-2.8 Nm) max.
34. Install remaining parts.
35. If control is to be tested on unit, install stroker block assembly and control on
pump control pad with O-rings (3, 31, and 45), gasket (19), washers (49) and screws
(2). Torque to 30 Lb.-ft. (40.8 Nm).
Remove plug over input shaft. Insert T handle 3/16” Allen wrench into opening.
Connect proportional control driver to proportional valve. Connect pressure gage on
SAE-4 port adjacent to proportional valve or valves.
Rotate wrench handle to check for free play. Turn spring stop adjustment in or out till
it just contacts the spring and there is no free play. Lock in place. Note: this adjust-
ment is critical to accurate neutral adjustment!
1. Turn trimmer screw to place input shaft on the zero stroke position. Check for posi-
tive centering. Lock in place. For cross-center pumps, set max. volume stops so that
servo shaft link touches stop pins when handle is stroked each side of center. For one
side of center pumps, set max. stop so that servo shaft link touches the stop pin. Set
min stop to prevent crossing over center. Lock stops in place.
2. 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:
3. 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).
4. If the change in pressure from start to end of stroke is incorrect, the spring (Figure
2) is incorrect and must be replaced.
5. If pressures are correct but current is incorrect, then either the coil is incorrect or
the proportional valve is bad.
6. With minimum signal, pump shall return to zero stroke within 200 psi. (13.8 bar)
max.
7. For cross-center pumps, repeat test on opposite side of center.
8. 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%.
1. Turn trimmer screw to place input shaft on the full stroke position. Lock in position.
2. Rotate input handle to reduce motor displacement to minimum. CAUTION! do not
exceed motor rated speed! Adjust minimum stop screw to set minimum displacement
at 25% of full displacement. (4 times the rpm at maximum displacement.)
89
CONT. LOCATION VALVE LOCATION
PUMP, CW-A, CCW-B VALVE “B”, FIG. 9A
PUMP, CW-B, CCW-A VALVE “A”, FIG. 9A
MOTOR, B MTG. VALVE “B”, FIG. 9A
MOTOR, A MTG. VALVE “A”, FIG. 9A
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)