This pinion is available as an individual replacement part. It fits between the needle bearing and the pump piston. The pinion is made out of metal and plastic and will need to be replaced if it breaks. A screwdriver may be needed when replacing this part. This is an authentic replacement part for chainsaws made by Husqvarna and Jonsered.
1 Removed chain,cover and bar
2 Removed recoil cover
3 Large end of spark plug wrench securely in vice other end on nut in middle of recoil (to hold so chain sprocket and clutch can be removed from other side of the saw)
4 Remove plate (1 screw)
5 Remove oil pump piston,pinion and oil hose
6 Reinstall new pu
... Read moremp piston, pinion and oil hose and reverse steps 4,3,2 and 1
Husqvarna 450E x torq
1.Removed top cover of motor
2.Removed spark plug
3.Removed bar and chain side cover, and removed bar and chain
4.Used a piece of 0.375GÇ¥ rope, pushed inside of spark plug hole to keep piston from cycling.
5. Take hammer and flat cold chisel and knock clutch loose.
6. Remove clutc
... Read moreh, sprocket, needle bearings, pinion.
7. Use screw driver to remove deflection plate.
8. Remove oil pump
9. Reassemble with new parts in reverse order.
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Husq 445e - chain continued to spin at idle - pinion galled to crankshaft
Removed clutch cover, bar and chain, clutch and drum, plate covering oil pump, then removed oil pump pinion, pump piston and pump cylinder.
Installed replacement parts and re-assembled saw.
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Oil pump not functioning, nylon pump gear was stripped. Replaced pinion also due to wear.
Removed bar and chain, removed clutch assembly, removed oiler plate, removed and replaced pinion and pump.
Also cleaned everything of debris before reassembly of the unit.
The ereplacement parts worked flawlessly, thank you.
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Model Cross Reference
This part works with the following models:
ERP Number: ERP8991514
Manufacturer Part Number: 503931801
This part is in stock in our warehouse and will ship out within 1 business day of the order being placed.
New stock is on the way! On order parts usually ship within 7 business days.
Item is not in stock and usually ships 10-15 business days from the time you place your order.
This item is no longer being made by the manufacturer, and cannot be added to your shopping cart.
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Mail-In Recycling Rebate
Some of the parts we sell are eligible for mail-in rebates since we can recycle them. We will display any applicable rebates in your shopping cart. To redeem your rebate, contact Customer Service after you have received your part.
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_WW_4.gif "Part Location Diagram of 503931801 Husqvarna Pinion")
