Hawk-industries Hawkjaw Jr. Manual 65K-2GJR Serial Numbers 21 to 3 Manuel d'utilisateur télécharger pdf (Page 66)

Trouble Shooting

Symptom Remedy

Hydraulic fluid heats up. (cont.)

66 Troubleshooting

known, tested hydraulic power unit, set the pump

pressure compensator setting at 2650 psi. Use an

allen wrench to rotate the pressure relief valve adjust-

ment 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.

The Raise/Lower Cylinder

moves at an undesirerable

speed.

 Adjust the metering valves located on the main

manifold.

 Check for any visual leaks in the hoses, fittings,

cylinder rod head, or cylinder rod wiper seal. Replace

if necessary.

 There is an inner seal leak in the cylinder. Shut down

the hydraulic power unit. Push in and pull out all

Grip buttons repeatedly to bleed all hydrau-

lic pressure. Pull out all Grip buttons. Disconnect

the air supply hose to the HawkJaw. Disconnect the

Raise/Lower cylinder Hanger Eye from the hanging

cable. Place the Raise/Lower cylinder Rod side end

on the rig floor. Connect the air supply hose to the

HawkJaw. Turn on the hydraulic power

unit. Push in the Lower button, and hold down the

Lower button. While holding down the Lower button,

check for Raise/Lower cylinder piston seal integrity.

Make sure no bodily parts are in the extension path

of the cylinder rod. Slowly loosen the HawkJaw

Rod side Leader hose. Check for fluid flow. If there

is a piston seal leak, fluid will flow with volume out of

the Rod side leader hose. Replace the seals. Replace

the cylinder if necessary. Push in the Raise button,

and hold down the Raise button. While holding

down the Raise button, check for Raise/Lower

cylinder piston seals integrity. Make sure no bodily

parts are in the extension path of the cylinder rod.

Continued on next page.

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Hawk-industries Hawkjaw Jr. Manual 65K-2GJR Serial Numbers 21 to 3 Manuel d'utilisateur Page 66

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