User Manual

MAINTENANCE
12–Rib Poly-V Belt — Tighten a
12–rib poly-V belt to 350 lbs (1,557
N), then run the engine at h igh idle for
30 minutes. Stop the eng ine and allow
a 10 – 15 minute cool down period.
Check tension with tool J 41251–B
or equivalent. If tension is 250 lbs
(1,112 N) or more, no retensioning is
required. If tensi on is less than 250 lbs
(1,112 N), retension to 250 lbs (1,112
N). Measure belt tension every month
or every 7,500 miles (12,000 km),
whichever comes first. Retension to
250 lbs (1,112 N) as required.
Belt Replacement — Drive belts
(V and poly-V) should be replaced
every 2,000 hours or 100,000 miles
(160,000 km).
Replace all belts in a set when one
is worn. Single belts of similar size
should not be used as a substitute for
a matched belt set. Premature belt
wear can result because of belt length
variation. All belts within a matched
set are within .032 in. (0.8 mm) of
their specified center distances.
When installing o r adjusti ng an
accessory drive belt, be sure the bolt
at the accessory adjusting pivot point
is properly tightened, as w ell as the
bolt in the adju sting slot. In addition,
check the t or que on the altern ator and
bracket mounting bolts. Retighten as
required.
Item 9 – Air Compressor
All air compressor intake parts
should be removed and cleaned at the
following i ntervals:
□ On Highway Vehicle Engines –
7,500 m iles (12,000 km)
□ Industrial Engines – 150 Hours o r
4,500 m iles (7,200 km)
To clean either the hair type or the
polyurethane type compressor air
strainer element, saturate it and
squeeze it in fuel oil or any other
cleaning agent that is not detrimental
to the eleme nt until it is dirt-f ree. Then
saturate t he element in lubricating oil
and squeeze it dry before placing it
back into the air strainer.
For air strainer replacement,
contact the nearest servicing dealer.
Replace hair type elements with the
polyurethane typ e , if available.
The air compressor moun tin g b olt s
should be tightened every 12 months
or 30,000 miles (48,000 km) f or
on-highway engines or every 300
hours for in dustrial applications.
74 All information subject to change without notice. (Rev. 01/04)
DDC-SVC-MAN-0058 Copyright © 2004 DETROIT DIESEL CORPORATION