Graco Reactor H-25 Series Repair And Parts Manual page 21

PROBLEM
Hydraulic pump does not develop
pressure. Low or zero pressure with
screeching noise.
312063Z
CAUSE
Pump is not primed or lost its prime.
Screeching noise is characteristic of
cavitation and is normal at initial
startup for a maximum of 30
seconds.
Hydraulic fluid is too hot.
Electric motor operating in wrong
direction for 3 Phase system.
Drive belt loose or broken.
Troubleshooting
SOLUTION
Check electric motor rotation. Both
motor and hydraulic pump must
rotate counterclockwise when viewed
from shaft end. If rotation is incorrect,
reverse leads L1 and L2. See
Connect Electrical Cord in
Operation manual 312062.
Check dipstick to ensure that
hydraulic reservoir is properly filled
(see Operation manual).
Check that inlet fitting is fully tight, to
ensure no air is leaking into the pump
inlet.
To prime pump, run unit at lowest
pressure setting and slowly increase
pressure. In some cases it may be
necessary to remove motor cover
and drive belt to allow for manual
(counterclockwise) rotation of
hydraulic pump. Turn fan pulley by
hand. Verify oil flow by removing oil
filter to see flow into filter manifold.
Reinstall oil filter. Do NOT operate
unit without a properly installed oil
filter.
If noise continues longer than 30
seconds, press motor
shut off the motor. Check that the
inlet fittings are tight and that the
pump has not lost its prime.
Ensure that the reservoir is properly
serviced. Improve ventilation to allow
more efficient heat dissipation.
Motor must operate
counter-clockwise from pully end.
Check drive belt condition. Replace if
broken.
key to
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