Specifications

GOLDCUP CONTROLS SERIES 400

TEST

Install a needle valve on the bypass valve exhaust port, connected to tank. Close the

valve.

Install a 1000 psi (70 bar) gage in the brake port.

1. Start prime mover and adjust compensator for 1000 psi (345 bar).

2. Turn centering trimmer screw to place input shaft on the zero stroke position.

Stroke pump towards full and release, on both sides of center. Pump shall return to

zero stroke within 200 psi (13.8 bar) max.

3. For 4C controls, unload pump, set maximum volume stops to full displacement.

4. Load pump. Stroke pump CW. 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 pres-

sure drops to 2000 psi (138 bar), on decreasing signal. Repeat by rotating input shaft

CCW. If pressures are incorrect remove piston assembly containing the adjustment

screw, to change ball gap setting. Extend adjustment to increase pressures, retract to

reduce pressures. Standard setting is .012” (0.305 mm) gap, which is 3/8 turn of

adjustment beyond closed position.

5. When ﬁnished adjusting, record both pressures for each rotation of the servo input

shaft.

6. 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 (345 bar).

Maximum leakage with control on center:

2.0 gpm (7.6 l/m)

Minimum leakage with control on center:

1.0 gpm (3.8 l/m)

Maximum leakage with control off center:

35 cu. in/min or .15 gpm (574 cm3/min. or 0.57 l/m)

7. Unload pump. Stroke pump above and below center. Control should operate

smoothly. Brake pressure should drop to case pressure each time control is on center,

and it should indicate servo pressure as soon as input shaft is rotated CW or CCW

from center, per step 4 above.

8. Release control when pump is off center. Pump should return to center

9. Remove needle valve from bypass exhaust port and install exhaust line.