I was wondering if there is anything I can do about the oil leaking. I have a hitachi cs33eb it is brand new.

special tools. take it to a shop

by a service kit that are made for your model

I do you a suggestion how you can do it yourself if you have a burner to heat up the bolts because of loctite sealant i think you know something of forces on that parts ? because of the tools that are neccesary to service it .
Here is a suggestion of a brand that is maybe there or coming in your Country . thats why i do this suggestion by a dutch link .
https://devs.hitachi-koki.co.jp/ois/explodedDiagram.html?type=svg&modelName=H+90SE&newwindow=true

If you know the brand of your hammer ? sometimes bought secondhand and no modelname google it on 3 words powertools the brand service or choose pictures if you will see pictures where you can see your hammer but there are can be marketing technical differences by the models because a suggestion i made by Hitachi the H90 and H90SE are not compatible by service kit a part of spares can only be used.
The time you spend is meaningless if you only think its leaking oil. because there is a thin lubrication inside most jackhammers and if that's leaking ,the working hours are on it, for time wasted re prematurely burned grommets make high-priority work bolt seal the front of the machine at the stroke chisel the first rings oil seals as well as the size of the stroke bolt must be tight and smooth, as if only a little air leaks burned den all your new o-rings (ie be hard in the short term) by overheating, use lubricants, not just fat because of the high temperature internal structure and the thermal conductivity of the parts together.

OIL ?? I think Hitachi has always a yellow grease lubrication
hitachi grease demolition hammer Google zoeken never seen heart of oil in Hitachi demolitions. but there could be models in your Country thats new for me .
Otherwise BOSCH HILTI and the one and only brand DUSS demolition hammers and also a few brands of Chinese hammers need oil lubrication . an expensive sinc-free hydraulic oil the same as used in some pressure washers life lasting oil but for HItachi look at the link for the grease 2 tubes a enough . good luck and dont forget the piston pin to replace with a new not only the gaskets and o-rings and also the oil and dirt seals on the front where the striking pin is that must be absolutely not air leaking because all your work burns in a few months again out . you can start all-over again.

How old is the nailer. If it is old enough and not oiled each use, O rings get damaged and will leak air at piston and trigger valve. Depending on the brand a rebuild kit may be available with new O rings and trigger valve.

check for spark when it fails to start could be a bad coil

see if you loosing spark when it doesn't start

DO NOT FILL to the plug threads on this compressor!!! The dipstick has a mark and it is very near the end of the stick. Any more questions please email or repost.
Tim

Hi, these impact drills need greese to function properly and some modles leek more than others. As its new you could ask for a new seal, as this is what is allowing the oil to leek. Hope this helps

Oil leaking out of the nailer anywhere is just an indication that too much oil is being introduced. A good solution would be to reduce the amount of drops until no more leaks out or use an in line oiler at the gun. An oiler costs under ten dollars and feeds in oil vapor as you use air. Store / hang your nailer with the air inlet down at night to drain out access oil. Do not worry too much about the leaking though, I think that a bit too much oil is better than a lack of oil. Good luck.

You need to Put Blue ATV Silicone on Both sides of the Gasket to get it to Seal Properly. This is a High Temp Sealant and Once Set it will fix the Problem.