Hawk Industries Hawkjaw Jr. Manual 65K-ALS Serial Numbers 4 to 9 - Manual (Page 85)

Trouble Shooting
Symptom Remedy
Trouble
Shooting
Troubleshooting 85
l
If there are no leaks in the hydraulic system, and the
pump pressure compensator setting is at 2600
psi on a known, tested hydraulic power unit, and the
hydraulic power unit pressure relief valve is set
above the pump pressure compensator setting
and the hydraulic fluid still heats up, then the
pressure relief valve setting on the HawkJaw has
been changed. The pressure relief valve adjustment
is set at Hawk Industries. Under no circumstances
should this pressure relief valve be adjusted. Adjust-
ing the pressure relief valve setting voids the
warranty and can cause severe damage to the
HawkJaw and the hydraulic power unit and
shorten component life. However, if this valve has
been adjusted below 2600 psi, and the pressure
compensator setting is at 2600 psi, the hydraulic
fluid will pass over the pressure relief valve. This
will heat up the hydraulic fluid rapidly. Properly set
the pressure relief valve adjustment. On a
known, tested hydraulic power unit, set the pump
pressure compensator setting at 2650 psi. Use
an allen wrench to rotate the pressure relief valve
adjustment clockwise until the bypass sound is no
longer audible. When the bypass sound ceases, stop
rotating the pressure relief valve adjustment.
While holding the pressure relief valve adjustment
steady with an allen wrench, lock in the adjustment
by tightening the pressure relief valve lock nut. Set
the pump pressure compensator setting back
down to 2600 psi. See Drawings, p. 102. Hydraulic fluid heats up.(cont.) Hydraulic
Fluid