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Workshop manual
Husqvarna Pruning Saw
325 P4
Gearbox
English
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Workshop Manual
Pruning Saws
Supplement for model 325 P4
Contents
5. Gearbox with oil pump______________________ 5
This supplement only takes up elements specific
to the above mentioned model.
For complete information when servicing we recommend that the supplement is studied together
with the Workshop Manual
(Order no. 101 90 75 -26)
and the supplement for brushcutters, trimmers,
pruners and hedge trimmers.
(Order no. 101 90 74-26)
© Copyright Husqvarna AB, Sweden 2000
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Gearbox with oil pump
5.
Contents
General ___________________________________ 6
Dismantling ________________________________ 6
Assembling _______________________________ 10
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Task of the gear:
It shall:
• Transfer the motion from the engine and drive
the chain saw .
• Be a mounting for the bar.
Gearbox with oil pump
General
325 P4:
See Brushcutter 325 in the Workshop Manual
101 89 22-01 and supplement
101 90 19-01 for the engine and shaft.
See the chain saw Workshop Manual for the bar and chain.
• Be the tensioning device for the chain.
• Supply the bar and chain with
lubrication so that overheating and
wear are avoided.
Deviations:
The speed is limited to 12,500 rpm.
Dismantling
325 P4:
Remove the gearbox from the engine
and shaft.
Remove the cover and bar with chain.
6
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Gearbox with oil pump
Remove the front slotted screw and
plate.
Remove the bar bolt and chain
adjuster.
5
Remove the four screws and oil cover
with gasket.
Remove the oil filter with hose and the
hose for chain lubrication.
Remove the locking screw for the oil
pump and oil-filling cap with chain.
The slotted screw in the cover should
not be removed.
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5
Gearbox with oil pump
Remove the locking washer on the
adjuster screw for the oil flow.
Unscrew the adjuster screw for the oil
flow and remove the screw.
Remove the oil pump.
Use a screw driver.
Note!
Exercise care. The pump piston can be
damaged.
Check that the pump piston and pump
housing have not been damaged.
Remove the threaded disc.
Remove the vibration damper
Remove the chain sprocket, washer and
spacer.
Replace the complete oil pump if the
pump is faulty
Use tool 502 52 37-01
502 52 37-01
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Gearbox with oil pump
Remove the circlip for the bearing on
the output axle.
Remove the outer circlip on the pinion
bearing.
5
Use circlip pliers.
Use circlip pliers.
First remove the pinion and pinion
bearing and then the output axle with
the two bearings, crown wheel and
eccentric cam.
Remove the inner circlip from the
pinion bearing and remove the bearing
from the pinion.
WARNING!
!
Risk for burns.
Wear gloves!
Heat using a hot air gun to approx.
125°C and knock against a wooden
surface.
Use circlip pliers. Replace the bearing
if necessary.
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5
Gearbox with oil pump
Remove the bearings from the output
axle.
Remove the eccentric cam for the oil
pump from the output axle.
Clean and inspect the component
parts.
Replace the bearings if necessary.
Replace the eccentric cam with signs
of wear.
Replace the crown wheel and pinion
at the same time.
Wash the bearings and blow dry using
compressed air. Hold the bearing so
that it does not rotate when blowing
clean. New bearings should not be
cleaned.
Wash off all old grease so that no
chips remain in the housing.
Blow out the channel for chain
lubrication using compressed air and
check that it is not blocked.
Assembling
325 P4:
Use weak nut lock fluid when stated in
the text during assembly.
Lubricate the components with grease
503 98 96-01 when assembling.
Fill all ball-bearings with grease.
Fit the large bearing on the output
axle. Punch 502 50 30-04.
Blow in both directions.
503 98 96-01
Turn the bearing with the sealed face
towards the thread.
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Gearbox with oil pump
Fill the grease pocket on the output
axle under the eccentric cam with
grease.
Fit the eccentric axle with the narrow
end towards the crown wheel.
5
503 98 96-01
Fit the small bearing on the output
axle. Punch 502 50 30-04.
Make sure there is 0.3 mm of axial
play between the eccentric cam and
collar on the output axle.
The eccentric cam shall engage with
the ball holder.
Machine the eccentric cam’s small
end surface to get the correct play, if
necessary. Make sure the bearing sits
against the collar on the axle
otherwise this affects the play
between the pinion and crown wheel.
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Gearbox with oil pump
Fit the bearings on the pinion. Turn the
sealed face outwards (towards the
shaft). Punch 502 50 30-08.
Fit the inner circlip on the pinion.
Heat using a hot air gun to approx.
125°C. Press in the output axle up
until the stop and fit the circlip before
the housing has cooled.
Press in the pinion to the stop and fit
the outer circlip before the housing has
cooled.
WARNING!
!
Risk for burns.
Wear gloves!
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Gearbox with oil pump
Check that the gearbox turns easily.
Position the spacer sleeve, washer,
sprocket, vibration damper and nut on
the output axle.
Check that the hub (A) and the disc (B)
on the vibration damper are not worn or
cracked. Replace if necessary.
Check that the rubber element (C) is
not worn or deformed. Replace if
necessary. All four rubber elements
B
C
A
C
should be replaced at the same time.
The threaded disc should be tightened
to 16 Nm.
Use tool 502 52 37-01
502 52 37-01
5
Fit the chain adjuster. The washer should be placed under
the screw head.
Fit the bar bolt. Secure using weak thread lock fluid.
Fit the plate and front slotted screw.
Secure the screw using weak thread
lock fluid.
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Gearbox with oil pump
Insert the pump piston in the pump
housing.
Lubricate the pump’s outer O-ring with
grease. Fit the oil pump complete.
Lubricate the oil adjuster screw’s Oring with grease. Fit the adjuster
screw.
Note!
Exercise care. The pump piston can be
damaged if scratching occurs.
Screw in the oil adjuster screw up to
the stop.
Position the oil adjuster screw’s locking
washer.
Make a basic oil flow setting, open the
oil adjuster screw 3 turns.
Lubricate the O-ring to the oil pump’s
locking screw with grease.
Fit the locking screw.
Fit a new locking washer.
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Gearbox with oil pump
Fit the oil filter with the hose on the
nipple closest to the shaft mounting.
Fit the hose for chain lubrication on
the two remaining nipples.
Fit the oil-filling cap.
Fit the oil cover with gasket.
5
Replace the filter and hoses if they
have aged.
Place the ring for the oil-filling cap’s
chain around the oil pump’s locking
screw.
Make sure the sealing surfaces (even
the gasket) are clean.
Secure the screws using weak thread
lock fluid.
Do not tighten too tight. Tighten
crosswise and only so the gasket
spreads out about 1 mm.
Fit the bar with chain and cover.
Adjust the chain tension and tighten
the nut on the cover.
Fill the angle gear approx. 2/3 full with
grease through the grease plug.
Fill the oil tank with chain saw oil, let
the gearbox stand for a few hours and
check that no leakage has occurred.
Make sure all contact surfaces are
clean.
Turn the chain as illustrated.
Bild 2 från kåpsidan. Visa hur kedjan
är monterad. Pil på muttern
503 98 96-01
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5
Gearbox with oil pump
Fit the gearbox on the shaft.
Test run. Set the oil flow for chain
lubrication.
Check and adjust the chain tension
after test running.
See the Instruction Manual.
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2001W15 1140011-26
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