20 Most Recent Hitachi NR65AK Round Head 1-1/2-Inch to 2-1/2-Inch Positive Placement Nailer Questions & Answers


Easy to remove the cylinder and piston/driver. Remove four head bolts and lightly tap head to release gasket. Push out driver by inserting rod thru nose then remove spring retainer holding the cylinder in place.. With retainer removed the cylinder should pop out. Sometimes the retainer will cause a bur to form on the body of the mailer making it s bit more difficult to remove. Good luck

Hitachi NR65AK... | Answered on Feb 21, 2019


So the first (most obvious but sometimes overlooked) thing - check to make sure the tank drains are closed.
Listen for a leak at the pressure switch - it will continue to leak after the compressor shuts off. If this is the case then you need a check valve (Part # 53A on the breakdown)
If it builds pressure but not enough to shut off and there are no leaks I would look at the valves located in the head (Part # 14 on the breakdown) - piston rings are not a normal failure part on this model but could also cause this.

Hitachi Air... | Answered on Feb 02, 2019


This problem is usually caused by reed valves or blown gasket between head and valve plate. Easy to check. After the compressor reaches 45 to 50 psi, with compressor still running, remove the air filter and feel for good suction at the intake port. If the air seems to be blowing out of the intake, then valves are bad. If you feel good suction at the intake, then air is leaking from the discharge tubing or other fittings. Good luck

Hitachi Air... | Answered on Jan 21, 2019


8 ounces of Synthetic Oil SAE15W40

Hitachi Air... | Answered on Jan 19, 2019


Pressure gage A shows the pressure in the tank. Pressure gage B shows what you have adjusted the output pressure to be. If it is reading 0psi and it is new it is probably because the manufacturer has set it at that level. You have an adjustment valve on the front of your compressor. Rotate it until you see the pressure start to rise then keep going to where you want it set at.

Hitachi Air... | Answered on Nov 27, 2017


insure that there is no debris ie., free from filings from the nails used or or ceck the feeder ports where the nail enters before it lives the port ( check for damage orifice or abstractions to it

Hitachi Air... | Answered on Sep 30, 2017


To remove the fan you will need a decent bearing puller - it is press-fit onto the armature shaft and doesn't come off easily.
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Hitachi Air... | Answered on Feb 19, 2017


recheck the "O" rings for one rolled over or nicked when assembling
put a small screw driver blade under the "o" rings and travel around the piston several times to allow the ring to settle in properly

Hitachi Air... | Answered on Jul 31, 2016


A lot of the compressors I have had were discontinued before I ever received them. I know what ordering the right part can be like. If you can give me a description of what the part does or where it is located I will brain storm with you to find a work around. If you leave a comment it will email me.

Hitachi Air... | Answered on Mar 21, 2016


it indicates that the start / run capacitors are failed
remove the power lead from the wall and get the details from the capacitor/s and go to a motor rewind shop and they will have replacement capacitors available
if you can take the capacitor/s with you it is even easier

Hitachi Air... | Answered on Oct 26, 2015

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