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2018/10/21 20:13:12
rosier72

Pressure Washer Leaking Oil From Pump Housing - Which seal kit shoudl I buy?

Hello Everyone,
I have a Dewalt 4200 PSI pressure washer it has been leaking more and more oil from the pumping unit.  I am trying to figure out which seal kit(s) would be best to fix the leak.
 
Here are the stats
Dewalt 4200
Honda GX 390
Comet ZWD-K 4042 (Pump)
 
This is what I found thus far on a few website searches.  
 
Water Seal Kit  
Check Valve Kit
Oil Seal Kit
Unloader Kit
 
 
 
9 comments Leave a comment
Roy
Oil seal kit, the others deal strictly with the water.
2018/10/21 20:47:37
rosier72
Awesome.  Thanks for the info :).
2018/10/21 21:30:29
AVB
Yes it is oil seal kit but I would going ahead replace the water seals too while you got the pump apart as usually they are heavily worn by the ceramic pistons. I replace more water packing kit then anything else on the pressure washer pumps.
 
The check valves are only needed if giving problem and the same with the unloader repair kit.
2018/10/22 01:40:24
rosier72
Hello,
I went ahead and ordered a few kits, I figured I might as well replace everything I can while I had it apart.
 
I ordered kit 100 (valve), 101 (water seal) and 103 (oil seal)
 
I was able to install kit 100 and 101.  When I got to 103 I realized that the kit had a lot of duplicates from 100/101...darn.
 
The parts No I didn't install yet are
 
14, 31, 37, 38, 46/65, 51 - it does not appear any of these are leaking oil and I don't want to touch anything that is not having an issue.
 
26- this was my main concern.  I got the ceramic cylinders off.  Now I can't really get to the rubber gasket.  I saw a youtube video of a fancy tool they used to remove one of these and then insert the new one.  Do I need to buy this, or can i pry it out with a screw driver?
 
 

2018/10/26 22:20:08
AVB
I use a homemade hook type seal puller to remove these but if the tool is reasonable it better to use it. Those plunger shafts are fairly soft and easily damaged.  Although the oil seal are rubber looking that is just the outer coating as they have tin/steel core. The rubber does make them much easier to remove and to install.
 
If you have a part number for the tool you mention I would like have it so I can at least look into it for possible addition to my tool collection.
2018/10/27 06:34:32
rosier72
Thanks for the response.  I searched around a little bit online and I am not able to find the actual part.

They use it in this video
 
https://www.youtube.com/watch?v=_8nEl1at4rM&t=219s
 
If the link doesn't work the youtube video is called "General Pump 47 Series Piston Guide Oil Seal Repair".  They use the tool at the 3 minute mark.
 
I am going to go try to pull that seal off now.  Thanks
Craig
2018/10/27 07:04:39
rosier72
Wow.  How on earth do you get that out!
 
Can I drill a small hole in the top of the existing seal and then put a small screw in there and pull it?  Or does that gap sit on a small ledge of the engine?
 
I also thought about getting a set like this to see if i can grab it.

 
Thanks
Craig
2018/10/27 08:03:01
AVB
I can tell you right now those will not work. No where near strong enough. Even if you manage to get them hooked in place the metal will separate from the plastic handle. This why I made my own puller. It like those seal puller that auto parts stores sell that just tear up on the very first attempted use.
 
Those picks do work for removing o-rings.
2018/10/27 13:25:07
rosier72
i found a set of "picks and hooks" that looked like something a dentist used.  I was able to remove 2 of the seals before the first one broke, and the 3rd seal with another hook in the set.
 
I have the pump back together and will pick up some pump oil this week.  Hopefully it runs like new.  Thanks for your advice on this.  Very much appreciated.
 
Craig
2018/10/27 18:37:08

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