Specifications

GOLDCUP CONTROLS SERIES 800
TEST
PUMP CONTROL PRESSURE
PUMP CONTROL SPRING
ADJUSTMENT
into the large hole in the servo link.
33. Place washer (32) against the spring washers.
34. Install O-ring (7) into groove in the remaining shear seal (18). Note: This shear
seal does not contain the two .094 radius scallops in the face. Place on top of washer,
(32). Position shear seal to match the lip on the servo link.
35. If control is to be tested on pump, install on pump control pad with gasket (19),
nyltite washers (3), and screws (2). Torque to 30 lb. ft. (40.8 Nm). Install bypass
check valves fittings, and lines.
Install stroking handle on the shaft.
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.
Install a 1000 psi (70 bar) gage in the brake port.
Rotate 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 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 handle is
stroked each side of center. Lock in place.
5. 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 adjustment made to the
spring preload. The following table may be used to determine adjustment required to
the nuts retaining the spring:
6. With minimum signal, pump shall return to zero stroke within 200 psi (13.8 bar)
max.
7. Repeat test on opposite side of center.
8. 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.
9. Stroke pump CW. The gage on the brake port should start to indicate servo pres-
sure 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 rotating input shaft CCW.
Record both pressures for each rotation of the servo input shaft.
10. 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).
80
CONTROL PRESSURE PRESSURE
FEATURE START FULL
00 75± 15 psi 335± 25 psi
(5.2± 1 bar) (23.1±1.7 bar)
04 75±15 psi 250± 25 psi
(5.2± 1 bar) (17.2± 1.7 bar)
CONTROL FEATURE PRESSURE CHANGE
PER 1/6 TURN ADJ.
00 6.8 psi (0.47 bar)
04 4.6 psi (0.31 bar)