John Deere CD4039DF008 - Manual (Page 53)

Maintenance/1000 hours/1 year
DPSG,CD03523,33 –19–12JUL99–2/2
RG4687
–
UN–20DEC88
4. If engine has a rubber dust unloading valve (C),
inspect the valve on bottom of air filter for cracks or
plugging. Replace as necessary.
5. Service air filter as necessary.
DPSG,CD03523,34 –19–13JUL99–1/2
CHECKING AUTOMATIC BELT TENSIONER
(POWERTECH ENGINES)
RG8098
–UN–18NOV97
Belt drive systems equipped with automatic (spring) belt
tensioners cannot be adjusted or repaired. The automatic
belt tensioner is designed to maintain proper belt tension
over the life of the belt. If tensioner spring tension is not
within specification, replace tensioner assembly.
•
Checking belt wear
The belt tensioner is designed to operate within the limit
of arm movement provided by the cast stops (A) and
(B) when correct belt length and geometry is used. If
the tensioner stop on swing arm (A) is hitting the fixed
stop (B), check mounting brackets (alternator, belt
tensioner, idler pulley, etc.) and the belt length. Replace
belt as needed (see REPLACING FAN AND
ALTERNATOR BELTS).
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