Stihl MS 440 Service Manual

9MS 440, MS 440 C
4.3 Chain Lubrication
Warning!
In the event of trouble with the chain
lubrication system, check and
rectify other sources of faults before
disassembling the oil pump.
Condition Cause Remedy
Chain receives no oil Oil tank empty Fill up with oil
O-ring on oil line to crankcase
defective or oil line damaged
Remove oil pump, fit a new O-ring
and refit or replace the oil pump
Oil inlet hole in guide bar is
blocked
Clean oil inlet hole
Intake hose or pickup body
(strainer) clogged or intake hose
ruptured
Clean intake hose and pickup body
(strainer) with standard solvent-
based degreasant not containing
chlorinated or halogenated
hydrocarbons / replace intake hose
and pickup body
Valve in oil tank blocked Clean or replace valve
Teeth on pump piston and/or worm
worn
Install new oil pump and/or new
worm
Machine losing chain oil O-ring on oil line to crankcase
defective or oil line damaged
Remove oil pump, fit a new O-ring
and refit or replace the oil pump
Piston bore in pump housing worn Install new oil pump
Oil pump delivers insufficient oil Adjusting screw and/or control
edge on pump piston worn
Fit new adjusting screw and/or oil
pump
Piston bore in pump housing worn Install new oil pump

Stihl MS 440 Specifications

General

Displacement	70.7 cc
Chain Pitch	3/8"
Ignition system	Electronic
Starter	Recoil starter
Vibration reduction	Anti-vibration system
Weight (without bar and chain)	6.4 kg
Fuel tank volume	0.73 L
Oil Capacity	0.36 L
Guide Bar Length	40-63 cm
Guide Bar Length (recommended)	40-71 cm (16-28 in)