John Deere CD4039DF008 - Manual (Page 54)

Maintenance/1000 hours/1 year
DPSG,CD03523,34 –19–13JUL99–2/2
RG7977
–
UN–14NOV97
•
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:
a. Release tension on belt using a breaker bar and
socket on tension arm. Remove belt from pulleys.
b. Release tension on tension arm and remove breaker
bar.
c. Put a mark (A) on swing arm of tensioner as shown.
d. Measure 21 mm (0.83 in.) from (A) and put a mark
(B) on tensioner mounting base.
e. Rotate the swing arm using a torque wrench until
marks (A) and (B) are aligned.
f. Record torque wrench measurement and compare
with specification below. Replace tensioner assembly
as required.
Spring—Specification
Force 18—22 N•m (13—16 lb-ft) .................................................................
DPSG,CD03523,35 –19–13JUL99–1/4
CHECK AND ADJUST ENGINE VALVE
CLEARANCE (300-SERIES ENGINES)
CD30544
–UN–19MAY98
NOTE: Valve clearance must be adjusted after the first
500 hours of operation, then every 1000 hours
thereafter.
Adjust engine valve clearance as follows or have your
authorized servicing dealer or engine distributor adjust the
engine valve clearance.
1. Remove rocker arm cover and crankcase vent tube.
2. Using JDE83 or JDG820 Flywheel Turning Tool (A),
rotate engine flywheel in running direction (clockwise
viewed from water pump) until No.1 piston (front) has
reached top dead center (TDC) on compression stroke.
Insert timing pin JDE81-4 (B) into flywheel bore.
35-3
112699
PN=54
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