Hawk Industries Hawkjaw Sr. Manual ALS Serial Numbers 1 to 100 - Manual (Page 69)

Trouble Shooting
Symptom Remedy
z
Push in the Grip 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 Grip air
valve. See Drawings, p. 128, 130.
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 Top Grip
hydraulic valve VG3, the Middle Grip hydraulic
valve VG2 or the Bottom Grip hydraulic valve VG1.
Push in the "E" stop button. Disconnect the Grip
button air hose to the Grip cylinder hydraulic valve
that extends at start-up. The Gray Grip air hose
connects to VG3. The green Grip air hose connects
to VG2. The black Grip air hose connects to VG1.
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 Grip air hose when
the "E" stop button is pulled out, replace the Grip
hydraulic valve VG1, VG2 or VG3. See
Maintenance & Repair, p. 66, Drawings, p. 114, 128.
z
If the Spin button is stuck in, the spinner will
operate. If the Spin button sticks, screw off the
button, and clean thoroughly. If the button still
sticks, replace the Spin button air valve. See
Drawings, p. 128, 130.
z
Make sure the hydraulic power unit is shut down.
Press the Grip button repeatedly to bleed hydraulic
pressure. Push in the Spin 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
Spin air valve. See Drawings, p. 128, 130.
One or more Grip cylinders
extend. (cont.)
Spinner moves forward, the
doors close and the spinner
begins to spin.
Trouble
Shooting
Troubleshooting 69
Movement
at Start-up
(cont)
Continued on next page.