Paccar MX-13, Operator'S Manual

Page: 77 / 111

Maintenance Procedures
Poly V-belt and Fan Drive
Removal
1. Disconnect the electrical ground
wire from the battery.
2. Reach between the fan blades and
remove the fan blade mounting
bolts using a 9/16” socket to
remove the mounting nuts.
3. Place a flex-bar with a 15-mm
socket on the automatic belt
tensioner roller fastener as shown.
Rotate the flex-bar as shown in
the diagram to relieve belt tension.
NOTE
When installing the belts do not wrap
4. With the belt tensioner pressure
belt around the tensioner until after
relieved, remove the poly V-belt
the belt has been wrapped around
from the pulleys.
all other pulleys and idlers.
°
The tensioner can be
temporarily blocked with
2. After installing the belt, carefully
a 0.16-0.2 inch (4-5 mm) thick
allow the belt tensioner to spring
pin (bore). This facilitates
back to its normal position. If the
removal and installation of the
tensioner had been temporarily
poly V-belt.
blocked, relieve tensioner
pressure enough to remove
5. After removing the belt, carefully
the locking pin, then allow the
allow the belt tensioner to spring
tensioner to spring back to its
back to the stop (if it had not been
normal position.
temporarily blocked).
NOTE
rust, and grease deposits. Clean
6. Inspect the pulleys for damage,
Do not reuse nylon patch lock nuts.
or replace as necessary.
Replace with new lock nuts when
reinstalling parts.
Installation
1. Place the new poly V-belt over the 3. Reinstall fan blade using fan blade
pulleys, making certain the belt
bolts and new 9/16" nylon patch
falls into all the belt pulley grooves.
lock nuts.
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