The throttle control cylinder is bracket mounted on
lever position in response to the amount of air pres-
the engine throttle linkage. It regulates the throttle
sure exerted by the foot throttle valve in the cab.
THEORY OF OPERATION
When the foot throttle valve is depressed, air pres-
piston modulates, the throttle lever also moves.
sure extends the control cylinder piston. The piston
When the foot throttle valve is released, an internal
changes position in relation to the amount of air
spring causes the piston to return to the idle position.
pressure received from the foot throttle valve. As the
CLEANING AND INSPECTION.
Clean all parts in a petroleum base solvent.
mineral spirits (stoddard solvent) or kerosene and dry
The lever assembly (2) does not have to
be removed to disassemble the cylinder.
as the bearing is pre-packed. DO NOT
Ensure all parts are clean and free of residue.
submerge the lever assembly in solvent.
Inspect parts for wear, corrosion, or damage.
Remove the dust boot (3).
Replace as necessary.
Remove the screws(S) and the cover (1).
Check the dust boot on the control cylinder pis-
ton rod to ensure it has no tears or worn areas.
Remove the 0-ring seal (14) from the body
Check the lever pivot points for excessive wear
Remove the piston assembly from the body (15).
Check the area around the control cylinder to
Remove the piston sleeve (4) and the springs
ensure that nothing will interfere with its operation.
(17 and 21).
Remove the capscrew (11) from the piston (16).
Coat the O-ring seal (14), the U-cup seal (13),
Remove the piston (16) from the cylinder shell
and the inside surface of the cylinder shell (18) with a
lubricant such as Dow-Corning No. 33 medium or
Remove the U-cup Seal (13) and the wear ring
(12) from the piston (16).