3-16
F-691-0913 Edition
OPERATING INSTRUCTIONS
Air Ride Operation
1.
Trailer air pressure must be maintained above 90 PSI
before operating.
PROTECTION VALVES
are used
to maintain 65 PSI air brake pressure during
suspension or remote system air loss.
2.
The semitrailer is equipped with a ride height control
valve located on rear axle.
CAUTION
Manual Height Control Operating
Instructions (825 and 835 Ag (Tail
Plate)
Figure 3-7: Air Ride Switch
(825D/835D Ag)
Normal Highway Operation
When vehicle is in motion, switch must be in “OFF”
position for normal height control valve automatic
operation
Raising or Lowering
To raise or lower vehicle, place switch in “ON” position
and regulate the height of the vehicle with the hand valve
If suspension air loss should occur, completely
deflate suspension and temporarily operate on
the air springs internal rubber bumpers. Carefully
proceed to the nearest semitrailer service facility.
To deflate the air suspension, disconnect the
lower connection on the linkage of the automatic
air valves. Rotate the valve control arms down
about 45
o
to exhaust the air. To restore to normal
operation, simply reverse the procedure.
AC-77-M-1 AND AC-77-S-1
OPERATING INSTRUCTIONS
When vehicle is in motion, switch
must be in “off” position for nor-
mal height control valve automatic
operation.
NORMAL HIGHWAY OPERATION
To lower vehicle place switch in
“on” position.
LOWERING
90044207
825-835 ag air ride
SWITCH
CONTROL HANDLE
Summary of Contents for 825D Series
Page 2: ......
Page 6: ...iv F 691 0913 Edition...
Page 14: ...2 6 F 691 0913 Edition STANDARD SPECIFICATIONS...
Page 40: ...3 26 F 691 0913 Edition OPERATING INSTRUCTIONS Page Intentionally Blank...
Page 60: ...4 20 F 691 0913 Edition MAINTENANCE AND LUBRICATION Figure 4 13 Axle and Brake Assembly...
Page 77: ...TROUBLESHOOTING GUIDE 5 9 Notes...
Page 78: ...5 10 F 691 0913 Edition TROUBLESHOOTING GUIDE...
Page 79: ......