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4. Disassembling the gear case section
(1) Slightly loosen the Chain Bar Clamp Nut [227]<227> while being careful not to remove it.
Turn the Oil Pump Adjuster [217]<217> counterclockwise to decrease the tension of the Saw Chain
[225]<225>.
NOTE: Turning the Oil Pump Adjuster [217]<217> counterclockwise decreases the tension of
the Saw Chain [225]<225>; turning it clockwise increases the tension.
(2) Remove the Chain Bar Clamp Nut [227]<227> and the Side Cover Comp. [207]<207>, and then
remove the Chain Bar 10 [226]<226> and the Saw Chain [225]<225>.
Loosen the Hex. Hole Bolt 5 x 22/S [190]<190> and the Hex. Hole Bolt 5 x 10 [198]<198>, and then
remove the gear case ass'y from the Main Pipe Comp. [170]<170>.
(3) Open the Oil Tank Cap Ass'y [188]<188> and then drain out the chain oil from the oil tank.
Remove the four Small Screws 4 x 12WS [209]<209>, and then remove the four Collars 3 [210]<210>,
Oil Tank Cover [176]<176>, and Oil Tank Gasket [177]<177>.
Remove Stop Ring E-6 [218]<218> and turn the Oil Pump Adjuster [217]<217> (with O-ring P-5
[178]<178>) counterclockwise to remove the adjuster.
Turn the Step Bolt A [180]<180> (with the O-ring P-5 [178]<178> and the 8 Push Nut [179]<179>)
counterclockwise to remove the Step Bolt A [180]<180>.
(4) Remove the Oil Pump Comp. [181]<181> together with the Filter Ass'y [211]<211>, Fuel Pipe 3 x 5 x
60 [214]<214>, Fuel Pipe 3 x 5 x 75 [215]<215>, O-ring [182]<182>, O-ring 1.4 [183]<183>, Washer
2 [184]<184>, Oil Pump Spring [185]<185>, and Oil Pump Piston Comp. [186]<186>.
(5) Remove the Stop Ring C-24, Inner [196]<196> to remove the Pinion [192]<192>, Ball Bearing 609
[193]<193>, Ball Bearing 609Z ST [194]<194>, and Stop Ring C-9, Outer [195]<195>; however, as
these parts cannot be removed by hand, heat the Case [220]<220> and then strike with a rubber
hammer in order to pull out the Pinion [192]<192>, Ball Bearing 609 [193]<193>, Ball Bearing 609Z
ST [194]<194>, and Stop Ring C-9, Outer [195]<195> as a complete set.
NOTE: Be sure to wear thick cotton gloves or similar protection when holding the heated Case
[220]<220>, so as to avoid burning your hands. Also be careful not to deform the Case
[220]<220>.
(6) Use a spanner to remove the Flange Nut 6 [206]<206> with both 32 mm wide sides of the Sprocket
Comp., 3/8 [205]<205> fixed in place, and then remove the Flange Nut 6 [206]<206>, Sprocket Comp.,
3/8 [205]<205>, and Collar [204]<204> in this order. Remove the Stop Ring C-28, Inner [203]<203> to
remove the Ball Bearing 638Z [202]<202>, Gear [201]<201>, Cam [200]<200>, and Ball Bearing 627
C3 [199]<199>; however, as the Gear [201]<201> cannot be pulled out by hand, heat the Case
[220]<220> and then strike it with a rubber hammer in order to pull out the Ball Bearing 627 C3
[199]<199>, the Cam [200]<200>, Gear [201]<201>, and Ball Bearing 638Z [202]<202> as a
complete set.
NOTE: Be sure to wear thick cotton gloves or similar protection when holding the heated Case
[220]<220>, so as to avoid burning your hands. Also be careful not to deform the Case
[220]<220>.
(7) Note that the Chain Bar Tightening Bolt [222]<222> cannot be removed; therefore, replace it together
with the Case [220]<220> if the Chain Bar Tightening Bolt [222]<222> breaks or becomes unusable.
Before removing the Pinion [192]<192>, use a hand press or similar tool to remove the Stop Ring C-9,
Outer [195]<195>, Ball Bearing 609 [193]<193>, and Ball Bearing 609Z ST [194]<194> in this order.
Likewise, before removing the Gear [201]<201>, use a hand press or similar tool to remove the Ball
Bearing 627 C3 [199]<199> and the Ball Bearing 638Z [202]<202>.
NOTE: When pulling out the Ball Bearing 627 C3 [199]<199>, be careful not to damage the Cam
[200]<200>.
-14-
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