John Deere PA01186 CS71 - Manual (Page 11)

11 English
OPERATION
Chain Tension
CAUTION
Chain tensioned while warm, may be too tight upon
cooling. Check the "cold tension" before next use.
C
Breaking-in the Chain
New chains will stretch and must be tightened frequently. Lift the
chain out of the bar groove and lubricate the bar groove with
additional oil, see Illustration (E). Place the chain saw on a piece
of cardboard or scrap plywood. Start the chain saw (refer to the
Operation-Starting Engine Section) and allow it to run at moder-
ate speed for approximately one (1) minute. Stop the engine.
Check that the oil pump is working properly. Safe-T-Tip® anti-
kickback device and the cardboard should have excess oil from
the chain rotation if the oil pump is working properly, see
Illustration (F). Adjust the chain tension (refer to Operation-
Chain Tension Section). Start the saw again and make a few cuts
in a log to heat up the chain. Stop the engine and re-adjust chain
again. Repeat this process until the chain retains proper warm
tension adjustment as shown in Illustration (C) in Operation-
Chain Tensioning Section. Do not touch the ground with the
chain.
B
WARNING
Never touch or adjust the chain while the motor is running.
The saw chain is very sharp, always wear protective
gloves when performing maintenance to the chain.
Bucking Spike
WARNING
Your chain saw is fitted with dual bucking spikes (G).
The bucking spikes are very sharp and can cause injury.
Be extremely careful when working near the bucking
spike. Removal of one of both bucking spikes will
violate the saws compliance of SAE J335 and other
standards. See Safety-State and Local Requirements.
F
E
1. Stop the engine before setting the chain tension. Make sure
the guide bar nuts are loose, turn the chain tensioning screw
clockwise to tension the chain. Refer to Assembly-Assem-
bling the Bar and Chain Section.
A cold chain is correctly tensioned when there is no slack
on the underside of the guide bar, the chain is snug, but it
can be turned by hand without binding.
2. Chain must be re-tensioned whenever the flats (A) on the drive
link tangs hang out of the bar groove. See Illustration (B).
3. During normal saw operation, the temperature of the chain will
increase. The drive link tangs of a correctly tensioned warm
chain will hang approximately .050 (1.25 mm) out of the bar
groove. See Illustration (C). To help determine the correct
warm chain tension, the tip of the combination wrench (D) can
be used as a guide.
A
.050 (1.25 mm)
.050 (1.25 mm)
D
G