Hawk Industries Hawkjaw Sr. Manual ALS Serial Numbers 1 to 100 - Manual (Page 71)

Trouble Shooting
Symptom Remedy
Movement
at Start-up
(cont) Torque Cylinder extends
slowly.
Raise/Lower cylinder moves.
z
Make sure the hydraulic power unit is shut down.
Press the Grip button repeatedly to bleed hydraulic
pressure. Access the main hydraulic block. See
Maintenance & Repair, p. 66, Drawings p. 114, 128.
At start-up, no air should reach the hydraulic valve
V1 at Port A. Push in the "E" stop button.
Disconnect the Torque button blue air hose to Port
A on the hydraulic valve V1. To disconnect the air
hose, push the hose and collet ring into the valve pilot
port. While holding down the collet ring, pull out the
air hose. Place your hand over the disconnected air
hose, and pull out the "E" stop button. No air
should come out of the hose. If air comes out of the
hose, replace the air logic system. See Maintenance
& Repair, p. 66, Drawings, p. 126. If no air comes
out of the Torque air hose when the "E" stop button is
pulled out, replace the hydraulic valve V1. See
Maintenance & Repair, p. 66, Drawings, p. 114, 128.
z
If the Raise or Lower button is stuck in, the Raise/
Lower cylinder will operate. If the Raise or Lower
button sticks, screw off the button, and clean
thoroughly. If the button still sticks, replace the
Raise or Lower button air valve. See Drawings, p.
132, 128.
z
Make sure the hydraulic power unit is shut down.
Press the Grip button repeatedly to bleed hydraulic
pressure. Push in the Raise button. Air should
sound like it is being sharply inhaled. Release the
button. Air should sound like it is being sharply
exhaled. If these sounds do not occur, replace the
Raise button air valve. Repeat for the Lower
button. See Drawings, p. 132, 128.
Trouble
Shooting
Troubleshooting 71
Continued on next page.