Hard
1-2 hours
Piston Bumper 885289
OEM part for: Metabo HPT
Part Number: 885289
$10.37
Usually ships in 7 - 12 business days
Leaves our warehouse within 7 - 12 business days
Compatibility
This Piston Bumper will fit the following 5 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Displaying 5 of 5 matching models.
Metabo HPT
5 total model matches. Try the above search to narrow your results.
This is the official OEM part for the following brands:
- Metabo HPT
This item works with the following types of products:
- Nailer
Questions & Answers ?
Our customer Service team is at the ready daily to answer your part and product questions.
Ask our Team
We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
Does this fit my product?Questions & Answers for Piston Bumper
No questions have been asked yet
Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Misfiring nail gain. It needed an overhaul.
Martyn - August 14, 2018
Tool Type
Nailer
Difficulty
Hard
Time
1-2 hours
Tools Used
Screwdriver, Pliers, Wrench Set, Allen keys, snap ring pliers, iPhone camera
Parts Used
1. Complete tear-down of the Hitachi gas nail gun cylinder assembly. The metallic cylinder assembly must be removed from the outer plastic casing. There are also two bright metallic guides that need to be removed before the two-part cylinder assembly can be separated. There are steel pins that locate those parts. Little teensy rubber O-rings retain the pins.
2. Removed the snap ring allowing the piston to be removed from cylinder
3. Removed and discarded the old piston bumper (it was in bad shape)
4. Cleaned all metallic parts with brake cleaner
5. Cleaned out the cylinder exhaust port and cleaned filter elements
6. Installed the new piston bumper
7. Lightly lubricated the cylinder with an approved gas nail gun oil (Pasload)
8. Lightly lubricated other sliding metal parts with the approved gas nail gun oil (Pasload)
9. Installed the cylinder carefully. Compressing the two rings was initially challenging. I ended up using 12 gauge copper electrical wire electrode and inserted those into the small recesses around the entry of the cylinder. I bent the wire pieces back over the edge of the cylinder housing to hold them in place and then inserted the piston. The wires acted as little ring squeezers (compressors) and allowed the piston to slide into the bore of the cylinder (this really deserves a picture). Make sure the rings gaps are opposite each other before installing the piston.
10. Re-install the snap ring
11. Then it was a matter of checking the piston was oriented correctly and could slide freely.
12. Reassembly - hard to detail here in this forum; there are at least 10 steps
13. The gun now works like new.
2. Removed the snap ring allowing the piston to be removed from cylinder
3. Removed and discarded the old piston bumper (it was in bad shape)
4. Cleaned all metallic parts with brake cleaner
5. Cleaned out the cylinder exhaust port and cleaned filter elements
6. Installed the new piston bumper
7. Lightly lubricated the cylinder with an approved gas nail gun oil (Pasload)
8. Lightly lubricated other sliding metal parts with the approved gas nail gun oil (Pasload)
9. Installed the cylinder carefully. Compressing the two rings was initially challenging. I ended up using 12 gauge copper electrical wire electrode and inserted those into the small recesses around the entry of the cylinder. I bent the wire pieces back over the edge of the cylinder housing to hold them in place and then inserted the piston. The wires acted as little ring squeezers (compressors) and allowed the piston to slide into the bore of the cylinder (this really deserves a picture). Make sure the rings gaps are opposite each other before installing the piston.
10. Re-install the snap ring
11. Then it was a matter of checking the piston was oriented correctly and could slide freely.
12. Reassembly - hard to detail here in this forum; there are at least 10 steps
13. The gun now works like new.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
OEM stands for Original Equipment Manufacturer and means the part you’re buying is sourced directly from the manufacturer who made your product. At eReplacementParts, we sell only genuine OEM parts, guaranteeing the part you’re purchasing is of better design and of higher quality than aftermarket parts.
Learn MoreOur product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
