Hawk Industries Hawkjaw Sr. Manual ALS Serial Numbers 1 to 100 - Manual (Page 77)

Trouble Shooting
Symptom Remedy
Tilt Forward
Button/Tilt
Back Button
(cont)
z
Check that the Tilt Forward or Back button air
valve works. Make sure the hydraulic power unit
is shut down. Press the Grip button repeatedly to
bleed hydraulic pressure. Push in the 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 Tilt Forward or Back button air valve.
See Drawings, p. 130,128.
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.
Check the Port VF/B sandwich valve H6 flow
setting. No fluid will flow to the Tilt cylinder if the
flow setting is rotated clockwise to refusal. See
Trouble Shooting, p. 93.
z
Check that air is reaching the Tilt hydraulic valve.
Make sure the hydraulic power unit is shut down.
Press the Grip button repeatedly to bleed hydraulic
pressure. The Tilt Forward Gray air hose connects to
Port A on the Tilt Forward hydraulic valve VF/B.
Disconnect the Tilt Forward button gray air hose
from the Tilt hydraulic valve VF/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 Tilt Forward gray air hose. Place your
hand over the disconnected Tilt Forward gray air
hose, and push in the Bottom Tilt air button. A
steady blast of air should come out of the hose. If
no air comes out of the hose, replace the air logic
system. See Drawings, p.126. If air comes out of
the hose when the Bottom Tilt air button is pushed in,
proceed to the next step.
Push in the Tilt Forward or Back
button, and nothing happens.
(cont.)
Trouble
Shooting
Troubleshooting 77
Continued on next page.