Specifications

GOLDCUP CONTROLS SERIES 800
8A CONTROL TEST SETUP
8A PUMP CONTROL
PUMP CONTROL PRESSURE
PUMP CONTROL SPRING
ADJUSTMENT
8A MOTOR CONTROL
face of cover.
26. Place two spring washers (17), nested with the bent sections matching each other,
into the large hole in the servo link.
27. Place washer (32) against the spring washers.
28. 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.
29. If control is to be tested on pump, install control on pump control pad with gasket
(19), nyltite washers (3), and screws (2). Torque to 30 lb. ft. (40.8 Nm).
1. Install stroking handle on the shaft.
2. Connect servo source, adjustable to 450 psi (31 bar), to control ports on hydraulic
stroker through a 4-way valve. Center position must dump both ports to tank at min.
pressure.
1. 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!
2. Turn trimmer screw to place input shaft on the zero stroke position. Set max. vol-
ume stops so that servo shaft link touches stop pins when handle is stroked each side
of center. Lock in place.
3. 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:
4. With minimum signal, pump shall return to zero stroke within 200 psi (13.8 bar)
max.
5. Repeat test on opposite side of center.
6. 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.
1. Set max. volume stop (6), on spring box end, to just contact the spool assembly.
Lock in place. Back trimmer screw out to full stroke position. Lock in place.
2. Set min. volume stop (15) to limit travel to 25% of full stroke. (4 times the rpm at
maximum displacement.) Caution! do not exceed motor rated speed! Lock in posi-
tion.
73
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)
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, 02, 03 6.8 psi (0.47 bar)
01 9.0 psi (0.62 bar)
04 4.6 psi (0.31 bar)