Hawk Industries Hawkjaw Jr. Manual 65K-ALS Serial Numbers 4 to 9 - Manual (Page 71)

Trouble Shooting
Symptom Remedy
Movement
at Start-up
Raise Button /
Lower Button
Torque cylinder extends.
(cont.)
Raise/Lower cylinder
moves.
Push in the Raise button or the
Lower button, and the
HawkJaw moves opposite the
desired direction.
See Drawings, p. 112, 118.
l
Make sure the air hoses are properly connected to
the Torque button air valve in the Right control
handle. See Drawings, p. 112.
l
If all hoses are properly connected and the Torque
button air valve works, replace the Torque
hydraulic valve V6. See Drawings, p. 102, 108.
l
The Raise button air valve or the Lower button
air valve is stuck in. Press the Raise button. Air
should sound like it is being sharply inhaled. Re-
lease 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. 110, 116.
l
Make sure the hydraulic power unit is shut down.
Make sure the Green Raise air hose connects to
Port B and the Black Lower air hose connects to
Port A on the Raise/Lower hydraulic valve. See
Drawings, p. 108.
l
Make sure the air hoses are properly connected to
the Raise button air valve and the Lower button air
valve in the Left control handle. See Drawings, p.
110.
l
If all hoses are properly connected and the Raise and
Lower button air valves work, replace the Raise/
Lower hydraulic valve V4. See Drawings, p. 106,
108.
l
Properly connect the Pressure and Tank lines. See
Operation, p. 14.
l
Properly connect the Raise/Lower Cylinder Rod
side and Cap side hoses to the HawkJaw Rod side
and Cap side Raise/Lower Cylinder Leader hoses.
See Installation, p. 13.
l
Properly connect the HawkJaw Rod side and Cap
side Leader hoses to the Main Hydraulic manifold.
See Drawings, p. 114.
Trouble
Shooting
Troubleshooting 71
Continued on next page.