Hawk Industries Hawkjaw Sr. Manual ALS Serial Numbers 1 to 100 - Manual (Page 73)

Trouble Shooting
Symptom Remedy
Movement
at Start-up
(cont)
RaiseButton/
Lower Button
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 Tilt hydraulic
valve VF/B at Port A or B. Push in the "E" stop
button. Disconnect the clear Tilt Forward air hose to
Port B. 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. Repeat for the Tilt Back
button. The gray Lower air hose connects to Port A
on the Tilt hydraulic valve VF/B. If no air comes out
of either air hose when the "E" stop is pulled out,
replace the Tilt hydraulic valve VF/B. See
Maintenance & Repair, p. 66, Drawings, p. 114, 128.
z
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, Drawings, p. 124.
z
Properly connect the HawkJaw Rod side and Cap
side Leader hoses to the Main Hydraulic block. See
Drawings, p. 124.
z
Check that the Raise and Lower air hoses are
properly connected in the Right control handle. See
Drawings, p. 128.
z
If all other air and hydraulic hoses are properly
connected, the air hoses are switched in the main
hydraulic block. Make sure the hydraulic power
unit is shut down. Press the Grip button repeat-
edly to bleed hydraulic pressure. Access the main
hydraulic block. See Maintenance & Repair, p. 66,
Drawings, p. 114, 128. Check to see that the Black
air hose goes to Port B and the Green air hose to
Port A on the Raise/Lower hydraulic valve VR/L.
Tilt cylinder moves. (cont.)
Push in the Raise button or the
Lower button, and the HawkJaw
moves opposite the desired
direction.
Trouble
Shooting
Troubleshooting 73
Continued on next page.