Sharp WQ-700H Specifications Page 28

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GOLDCUP CONTROLS SERIES 500
See Figure 5A-1 or Figure 5A-2
TEST, PUMP CONTROL
TEST, MOTOR CONTROL
5. Carefully remove the filter without dislodging dirt into the opening. In recent con-
trols, this filter is retained by a drilled hex plug. Backflush as before by forcing filtered
oil into the port behind plug (13). Clean and install filter.
6. Examine surface of control cover for excess scratching. Examine shear seal for
contamination in balance pads or deep scratches. Stone lightly to remove raised burrs
and dings. Check that grooves supplying servo oil to balance pads are open.
7. Place two spring washers (1-6), nested with the bent sections matching each other,
into the large hole in the servo link.
8. Place washer (1-10) against the spring washers.
9. Install O-ring (1-8) into groove in the shear seal (1-7). Install shear seal. Place on
top of washer, (1-10). Position shear seal to match the lip on the servo link.
10. If control is to be tested on unit, install on control pad with new gasket and new
Nyltite washers under screws. Torque to 30 lbs- ft. (40.8 Nm). Connect servo line and
electrical connector to stroker.
1. With servo pressure applied, bleed air from force motor by loosening the screws
holding the electrical connector to the cap. If force motor faces down, bleed air from
the stroke limiting screws. Command stroker back and forth to assure that all air is
purged from the stroke piston, and stroker is functioning properly.
2. Set compensator to 1000 psi (69 bar). Block pump outlet lines. Shut off external
servo supply to control.
3. If system contains a shuttle valve, disable the shuttle valve as follows:. If shuttle is
on the pump, turn the shuttle relief adjustment two turns in. If system contains a
Denison shuttle mounted on the motor, remove shuttle and plug the two threaded ports
with 3/8-24 setscrews. Re-install the valve.
4. Adjust and lock the mechanical trimmer for minimum system pressure on both ports.
Connect a handle to the .375” (9.52 mm) dia. shaft extension on the stroker. Stroke
the pump both sides of center. Do not exceed 100 lbs-in. (11.3 Nm) torque. Release
handle and observe pressures on system ports. Continue adjustment till pressure is
less than 150 psi (10.3 bar) difference on either side.
5. For controls with deadband, (feature 00). To set jet pipe null adjustment, discon-
nect electrical signal and supply servo oil to stroker. (200 psi min, 1000 psi max.) (14
bar min., 69 bar max.). Rotate the jet pipe null adjustment CCW and CW to develop
700 psi (48 bar) on each system port. Caution: always begin adjustment by back-
ing out (CCW) on the jet pipe null adjustment and observing control reaction.
Overadjusting clockwise direction can damage the jet pipe or the trimmer
spring. Set the screw midway between these two limits and lock. Torque to 10 lbs-in.
(1.1 Nm) max. Install O-ring and cover nut.
6. Reconnect electrical signal and zero the electrical driver “zero adjustment” for mini-
mum pressure.
7. Stroke to full displacement. Turn in maximum stroke stop till pump just commences
reducing stroke. Lock in this position. Repeat with current of opposite polarity
8. Slowly apply current to the valve. Note the value of current at which pressure starts
to build (e.g. +40MA). Back off current and slowly apply the opposite polarity current to
the valve. Note the value of current at which pressure builds the opposite side of cen-
ter (e.g. -50MA). The sum of the absolute values must be between 50 and 100 MA
(e.g. 40 + 50=90MA), and the difference between the two absolute values must be less
than 20MA. (e.g. 50 - 40=10MA). If not within specification, readjust jet pipe null.
9. For controls with no deadband, (feature 01), disconnect the electrical connector,
supply servo oil to the control. Set and lock the jet pipe null adjustment at the point of
minimum system pressure on both ports with pump at operating temperature. Torque
to 10 lbs-in. (1.1 Nm) max. Caution: always begin adjustment by backing out
(CCW) on the jet pipe null adjustment and observing control reaction.
Overadjusting clockwise direction can damage the jet pipe or the trimmer
spring. Install O-ring and cover nut.
10. For all controls, apply 330MA to the control. The pump should go to full displace-
ment. With the “A” terminal positive, control shaft should rotate CCW. Repeat for
opposite side.
11. With pump at full displacement, block the servo supply to the stroker, The pump
should spring center within 3 seconds.
12. Check for smooth change in displacement with gradual increase and decrease of
control signal.
13. Restore shuttle valve and system pressure settings to original operating condi-
tions.
1. With servo pressure applied, bleed air from stroker force motor by loosening the
screws holding the electrical connector to the cap. If force motor faces down, bleed air
from the stroke limiting screws. Command stroker back and forth to assure that all air
is purged from the stroke piston, and stroker is functioning properly.
2. With motor running at low speed and servo supply shut off, turn in maximum stop
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