Perkins 4006 User Handbook Manual page 34

MAINTENANCE PROCEDURES
FAN BEARINGS AND BELTS
WARNING
OTHER MEANS OF STARTING.
Remove the mesh guard around the fan
belts, grease the fan and jockey pulley
bearings Fig. 23 using high melting point
lithium based grease (e.g. Shell Alvania
R.A.)
Check the tension and condition of the fan
belts. Using a spring balance and rule, or a
belt tension indicator, check that the force
compares with the kgf (lbf) values shown
below for the correct belt deflection. See Fig.
23.
Deflection kg Force
3 - 4.3
11 mm
Fan belts if worn, should be replaced as a
complete, matching set. Individual belts
should NOT be replaced.
force
Fig. 23
30
DISCONNECT
BATTERIES OR ANY
lb Force
6.67 - 9.47
deflection 11 mm
To adjust slacken the jockey pulley pivot and
adjuster bolts, and operate the jockey pulley
lever.
Moving the jockey pulley lever outwards will
tension the belts and inwards will slacken the
belts.
The correct tension
measuring the deflection at the mid point
between the fan pulley and the crankshaft
pulley when the above force is applied.
To apply the force place a rule across the
outside width of the belts and attach spring
balance as shown Fig. 23 pull on the spring
balance until the required force is reached
and measure the belt deflection.
Adjust the position of the jockey pulley lever
until the force on the spring balance and the
belt deflection agree with the figures given
above.
is obtained
4006/8 Diesel, May 1998
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