Paccar MX-11, Operator'S Manual

Page: 93 / 121

back to the stop (if it had not been
temporarily blocked).
5. Inspect the pulleys for damage,
rust and grease deposits. Clean or
replace as necessary.
Poly V-belt, Alternator, Air-
Conditioning Compressor Drive
and Coolant Pump Drive Install
Follow the steps below to install the poly V-
belt, alternator, air-conditioning compressor
drive and coolant pump drive belts:
1. Place the new poly V-belt over the
pulleys, positioning the new belt so
that it falls into all the belt pulley
grooves.
NOTE
When installing the belts DO NOT
wrap belt around the tensioner until af-
ter the belt has been wrapped around
all other pulleys and idlers.
2. After installing the belt, carefully
allow the belt tensioner to spring
back to its normal position. If the
tensioner had been temporarily
blocked, relieve tensioner pressure
enough to remove the locking pin,
then allow the tensioner to spring
back to its normal position.
3. Reinstall the fan drive poly V-belt
as previously described in
Poly V-
belt and Fan Drive Belt Installation
on page 89.
4. Reconnect the electrical ground
wire to the battery.
Aftertreatment System
Diesel Particulate Filter (DPF)
Service Strategy
There are two DPF cleaning strategy
options; dry cleaning and wet cleaning.
Some chassis can follow either strategy
but only one strategy may be used. They
are not interchangeable. It is the vehicle
owner’s responsibility to choose one of the
two options and maintain the DPF using
that one strategy. The wet cleaning service
interval is twice as long as the dry cleaning
interval. Both strategies are shown on the
Preventative Maintenance Schedule.
NOTE
DO NOT switch from one cleaning
strategy to the other. Doing so may
void your warranty.
NOTE
The DPF dry clean/wet clean intervals
are based on the use of lubricating oils
that meet the SAE 10W-30 API CK–4/
CJ-4 oil specification.
1. Dry Cleaning strategy - Normal
Duty/Line Haul may use this
strategy; however, Severe Duty/
Vocational applications must only
use the dry cleaning strategy. Dry
cleaning can be performed at an
authorized PACCAR dealer.
Replace filter if necessary.
2. Wet Cleaning strategy - Only
Normal Duty/Line Haul may use
this strategy. A wet cleaned filter is
one that has been cleaned to
PACCAR specifications using
advanced liquid cleaning
technology. Wet cleaned filters can
ENGINE MAINTENANCE - Maintenance Procedures
Y53-1166-1M1 (10/2020) 91
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