John Deere POWERTECH 4045 - Manual (Page 154)

Lubrication & Maintenance/500 Hour/12 Month
OURGP11,0000080 –19–27JUL06–3/3
RG7977
–UN–14NOV97
Marks on Tensioner
RG8037C
–UN–11SEP00
Align Marks
RG12065
–UN–28JAN02
Align Torque Wrench With Pulley and Tensioner
A—Mark On Swing Arm
B—Mark On Tensioner Mounting Base
C—Torque Wrench
Checking Tensioner Spring Tension
A belt tension gauge will not give an accurate measure of
the belt tension when automatic spring tensioner is used.
Measure tensioner spring tension using a torque wrench
and procedure outlined below:
NOTE: Later engines have a 12.7 mm (1/2 in.) square
hole in tensioner so no socket drive is required.
1. Release tension on belt using a breaker bar and
socket (if required) on tension arm. Remove belt from
pulleys.
NOTE: While belt is removed, inspect pulleys and
bearings. Rotate and feel for hard turning or any
unusual sounds. If pulleys or bearings need
replacement, see your John Deere dealer.
2. Release tension on tension arm and remove breaker
bar.
3. Put a mark (A) on swing arm of tensioner as shown.
4. Measure 21 mm (0.83 in.) from (A) and put a mark (B)
on tensioner mounting base.
5. Install torque wrench (C) so that it is aligned with
centers of pulley and tensioner. Rotate the swing arm
using a torque wrench until marks (A and B) are
aligned.
6. Record torque wrench measurement and compare with
specification below. Replace tensioner assembly as
required.
Specification
Spring Tension—Torque 18-22 N•m (13-16 lb-ft) .......................................
NOTE: Threads on belt tensioner roller cap screw are
LEFT-HAND threads
30-15
080706
PN=152