Tag, loosen, and disconnect two hose fittings from pressure reducing
valve and pressure protection valve.
Tag, loosen, and disconnect air horn valve tube fitting from tee.
Remove two nuts, lock washers, and capscrews securing pressure protection
valve to welded bracket.
Remove pressure protection valve and pressure reducing valve with tee,
nipple, and elbows as an assembly.
Put pressure protection valve in vise. Loosen and remove tee with nipple
and pressure reducing valve. Loosen and remove elbow.
( 2 )
With pressure protection valve installed in vise, connect tee and pres-
sure reducing valve to pressure protection valve outlet port.
Install elbow in pressure protection valve inlet port.
Put pressure protection valve with pressure reducing valve in position in
loader on welded bracket.
Install and tighten two capscrews, lock washers, and nuts.
Connect and tighten two hose fittings to elbows installed in pressure
protection valve and pressure reducing valve.
Connect and tighten air horn valve tube fitting to tee.
Close front access door,
Close air reservoir drain valve.
Start engine and operate at idle speed. When pressure indication on AIR
PRESS gage located on left instrument cluster no longer increases, turn
Check for air leaks by applying soap solution to pressure protection
valve connections. Tighten fittings as necessary.