It is a high-quality OEM item which is made for Husqvarna and Jonsered chainsaws. The piston is secured inside the cylinder in order to create pressure and push the oil. Over time due to friction and heat, it may wear out or even get damaged eventually requiring a replacement to maintain a properly working oil pump. Note, never use waste oil. This results in damage to the oil pump, the bar, and the chain. It is also important to use oil of the right grade (suitable viscosity range) in accordance with the air temperature. Make sure to refer to the owners manual and the appropriate diagrams of your model for the correct installation of the new part. You will need to use appropriate tools in order to remove the chain, the bar, and the sprocket in order to perform this repair. This pump piston is made of durable materials and is sold as an individual component. Keep in mind, other parts of the oiler mechanism are all sold separately.
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★★★★★
★★★★★
Chainsaw
Great part easy to replace
Guest - December 2, 2019
Verified Purchase
★★★★★
★★★★★
Husqvarna Chain Saw
One of the parts I ordered for my Husqvarna chain saw was not the correct part. It was incorrectly listed on the parts list. I was able to return that part and get it replaced with the correct one. They even waived the shipping cost of the replacement part, so I was completely satisfied with the transaction. My refund for the wrong part was received in a timely manner. I would recommend eReplacementParts to anyone who needs parts.
Larry - December 14, 2019
Verified Purchase
★★★★★
★★★★★
Great fast service.
Very fast service. Easy to use.
Guest - April 12, 2020
Verified Purchase
★★★★★
★★★★★
Worked as expected
The parts arrived quickly and worked correctly.
Guest - July 1, 2020
Verified Purchase
★★★★★
★★★★★
Too slow
The job was finished nearly a month ago as I was able to find an alernate source that delivered much faster at a third the cost.
Iglobal - June 26, 2020
Verified Purchase
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I removed the bar and chain. Then popped the cover off the top of the saw removed the spark plug and put in this special piston stopper I got when I converted my saw to a chain saw carving saw. Then I put some vise grips clamped to the clutch used another wrench to turn the clutch till it came off. Removed the clutch and all the other inn
... Read moreer. Then removed the metal shield plate and got access to the piston and pump and oil tube thingy. Swapped all that out cleaned the old oil bar oil off and put it all back together the way I took it apart.
Took the bar and chain off, removed the clutch, and sprocket. Took out the Oiler pump assembly, drained, and thoroughly cleaned the oil tank. Reinstalled all the new parts, leak fixed. Runs great
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The chain oiler pump was defective on my 450 20 inch Husqvarna chainsaw
1 Pull spark plug and stuff a nylon rope into the cylinder to remove the clutch assembly.
2 Get a wrench or spanner type tool and place it in the clutch and rotate it clock wise until it the ads off the shaft ( The rope you cramped cyl stops the piston from moving )
3 REMOVE THE clutch asst. And the cover exposing the pump
... Read more 4 REMOVE the old parts clean and inspect for blockage pre oil the new pump parts re install the cover then the clutch assy. fill the oiler with bar oil
5 Before installing the chain and bar start the saw and check to see if the oil is coming out.if so put the bar and chain on and get to cutting, oh yeah
removed chain guard, chain & chain bar, clutch, pin bearing sleeve, oil hose & any part that has been chaffed. cleaned out saw dust/oil build ups.replaced parts where needed.installed chain & bar. adjusted to. proper tension. lubed internal parts on the rebuild. gapped new spark plug & replaced. put in 50:1 gas mix & bar oil.
star
... Read moreted up saw & checked bar oil spray on a piece of cardboard. good as new !!
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
Oil tank vent located under wear plate above oil outlet was plugged with debris. removed wear plate and blew out with compressed air.
The only trick to replacing brake band was for reassembly was to remove clutch drum to reset the hand guard engagement.
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.
1. Remove the chain, the bar, and the side plate.
2. Remove the top cover and the spark plug.
3. Stuff 3 inches of a pull cord into the plug hole
4. Place the handle ends of mechanics pliers into the clutch and w/large a screwdriver as a lever, rotate clockwise.
5. Disassemble the clutch, the bearing, and the plate
... Read more then, the flat plate covering the oil piston.
6. Disassemble the piston, the cylinder, and the mount. Replace with the new.
7. Reverse the disassembly steps. Grease the needle bearing.
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Model Cross Reference
This part works with the following models:
ERP Number: ERP9028551
Manufacturer Part Number: 540057901
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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_WW_10.gif "Part Location Diagram of 540057901 Husqvarna Chainsaw Pump Piston")
