2-Groove Powerband; 12-Rib Poly-V Belt - Detroit Diesel 60 Operator's Manual

Run the engine for 10 to 15 minutes
to seat the belts, then readjust tension.
Check and retension belts after 1/2
hour and again after 8 hours or
250 miles (400 km) of operation.
Thereafter, check the tension of the
drive belts every 100 hours or 6,000
miles (10,000 km) and adjust, if
necessary.
If a belt tension gage is not available,
adjust the belt tension so that a firm
push with the thumb, at a point
midway between the two pulleys, will
press the belt .50 in. – .75 in. (13 –
19 mm).
2-Groove PowerBand — The
2-groove PowerBand® is used with
the 50 DN alternator. To provide
proper running tension for the belt,
current Series 60 engines use an auto
belt tensioner, which requires no
adjustment. See Figure 14.
Figure 14 Auto Belt Tensioner
Assembly with 50 DN
Alternator
All information subject to change without notice.
DDC-SVC-MAN-0039
SERIES 60 ON-HIGHWAY ENGINE OPERATOR'S GUIDE
Copyright © 2009 DETROIT DIESEL CORPORATION
Earlier-built Series 60 engines have
a manual belt tensioner assembly.
See Figure 15.
Figure 15 Manual Tensioner
Assembly with 50 DN
Alternator
Tighten a new PowerBand® drive belt
to 200 lbs (890 N), then run the engine
for 10 minutes at 1200 rpm. Stop the
engine and allow a 10 – 15 minute
cool down period. Check tension. If
less than 150 lbs (667 N), retension
to 150 lbs (667 N). Following initial
tensioning, measure belt tension
every month or every 7,500 miles
(12,000 km), whichever comes first.
Retension belt to 150 lbs (667 N) at
these intervals.
12–Rib Poly-V Belt — Tighten a
12–rib poly-V belt to 350 lbs (1,557
N), then run the engine at high idle for
30 minutes. Stop the engine and allow
a 10 – 15 minute cool down period.
Check tension with tool J 41251–B
65