TROUBLESHOOTING AIR SHIFT MALFUNCTIONS Probable Cause
Remedy
a. Low system air pressure
a. Wait for pressure to build back up to normal.
b. Restricted or clogged air filter in range shift valve
b. Replace air filter.
c. Restricted air line (bent, squeezed, twisted, etc.)
c. Re-route and/or replace air lines.
d. Air lines too small
d. Replace with correct size air lines.
e. Defective O-rings in air shift cylinder
e. Replace O-rings.
f.
f.
Scored air shift cylinders or pistons
Repair or replace cylinders or pistons.
g. Defective range shift valve and/or air shift selector valve (on shift lever)
g. Repair or replace as needed.
h. Defective synchronizer
h. Repair or replace as needed.
i.
Range synchronizer friction discs worn or burned
i.
Replace synchronizer discs as needed.
j.
Intermixed synchronizer parts
j.
Install matched parts.
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