AIR SYSTEM COMPONENTS
SUB-SECTlON 9C
OVERHAUL. Overhaul of this cylinder should be limited
LEAKAGE TEST. Perform the following leakage test to
to the replacement of the parts furnished in the repair kit
determine if the throttle cylinder is suitable for continued
for the cylinder. To overhaul the cylinder, proceed as fol-
service.
lows (see Figure 9C-14):
1. Fully charge the air system.
NOTE
2. Fold back the dust boot on the air cylinder. Then coat
It is possible to overhaul the cylinder while it is on
the area around the piston rod with a soap solution.
the machine. However, removing the cylinder would
simplify the procedure.
3. Have an assistant depress and hold the throttle pedal in
either the upper or lower cab. Determine whether .or not
1. Remove the machine screws that secure the cover to the
leakage exists at the cylinder piston rod. No leakage is per-
body, and remove the cover.
missible.
2. Remove the old diaphragm.
4. If leakage is present, it is recommended that the cylinder
be replaced or overhauled.
3. Remove and discard the two clevis pins and cotter pins
securing the cylinder lever.
REMOVAL. To remove the throttle cylinder, proceed as
follows (see Figure 9C-13):
4. Remove and discard the dust boot. Push the piston into
the body, and loosen the jam nut. Remove and discard the
clevis, and then remove the jam nut.
1. Drain the air system bv opening the drain cock on each
reservoir. Depress and release the throttle pedal in the up
5. Slide the piston assembly out of the body. Remove the
per and lower cab several times to vent any air pressure
thrust ring from the piston.
which may be trapped in the throttle system.
6. Install a new thrust ring on the piston, with the lip of
2. Disconnect the throttle link at the cylinder by removing
the thrust ring facing the diaphragm end of the piston.
the pin which connects the throttle link to the cylinder
lever.
7. Coat the body bore with light grease. Then install the
return spring and piston assembly in the body. Push the
3. Disconnect the air line at the cylinder. Remove the
piston into the bodv until the piston rod extends from the
mounting capscrews, lockwashers, and nuts, and remove the
body, and then install the jam nut on the piston rod.
cylinder.
Figure 9C-14. Throttle Cylinder (36U30)
9C-15
