To gain access to the inversion valve on some series of
vehicles the drivers seat must be removed and the floor
panel under the seat must be removed.
Set parking brake or block wheels to prevent
vehicle from moving.
Remove the air line at the control port, supply
port and delivery ports.
Connect the air line from control port (from
tractor protection valve) to the supply port. Plug
the delivery port.
With 689-861 kPa (100-125 psi) in air system,
apply the brake valve or hand control valve.
Apply soap solution to the supply cap nut control
port and exhaust port. There should be no air
leakage at the supply cap nut and a very slight
leakage is permissible at the exhaust and control
ports. Excessive leakage at the control port
would indicate the O-ring on piston stem is faulty
and excessive leakage at the exhaust port would
indicate that the piston stem exhaust seat or inlet
valve is faulty. Release the brake valve or hand
Disconnect the line at the supply port and
remove plug from delivery port. Reconnect the
air line from tractor protection valve to the control
Apply either the brake valve or hand control
Apply soap solution to the exhaust port and
supply port. Excessive leakage at exhaust port
would indicate the piston O-ring is faulty and if
air leakage at supply port is noted, the O-ring on
piston stem is bad. A slight leakage is
If valve passes the leakage test connect the two
remaining air lines. The air line from the air
cylinder is connected to the delivery port and the
air line from the solenoid control assembly is
connected to the supply port. If the valve failed
the leakage test it must be replaced.
REMOVE AND REINSTALL
On some series of vehicles the inversion valve is located
below the floor panel under the drivers seat. To gain
access to the valve the seat and floor panel must be
removed. Be sure to set the parking brake.
Disconnect air lines at valve.
Remove mounting bolts.
Transfer fittings to new valve.
Remount valve to holes in holes provided.
Reconnect air lines as follows:
Air line from tractor protection valve to control
Air line from solenoid control assembly to supply
Air line to air cylinder is connected at delivery
CTS -4079-CHAPTER III-
PRINTED IN UNITED STATES OF AMERICA