Model H-2000/H-3500 Proportioning Unit
34 159421A-1, Issue 2
indication to the operator of over-pressure. This is not a lockout type of system and
when the pressure bleeds off below approximately 2200 psi / 3700 psi the system will
be restored to normal operation; however, the cause of the over pressure should be
determined and corrected. The three most likely causes are:
a)
A restriction in the gun
b)
Cavitation of the opposite pump
c)
Hydraulic pressure set too high
6.
CONTROL TRANSFORMER FUSE-
with power OFF, remove the
transformer fuse and check it for
continuity or simply replace it with one
known to be good.
Figure 26. Control Transformer
Fuse
WARNING:
T
HE FUSE MUST BE REPLACED WITH ONE OF THE SAME RATING
. A
SUBSTITUTE
MAY DAMAGE THE EQUIPMENT
.
Hydraulic Drive System
WARNING:
B
EFORE PERFORMING THESE TROUBLESHOOTING PROCEDURES DETERMINE
THAT ALL CIRCUIT BREAKERS ARE OFF AND MAIN POWER IS DISCONNECTED AT THE SOURCE TO
AVOID SEVERE BODILY INJURY FROM ELECTRIC SHOCK
. D
O NOT ENTER ELECTRIC CONSOLE
WITH POWER ON
.
Try the recommended solutions in the order given for each problem to avoid unnecessary
repairs. Also, determine that all circuit breakers, switches, and controls are properly set
before assuming there is a problem.
Problems
Solution
Electric motor will not start or stops during operation. 1
Hydraulic pump does not develop pressure. 2
Low or zero pressure with screeching noises. 2, 3
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