Replacement Parts for Cheap Pressure Washer Axial Pumps

[hit_4_show]

Have you located replacement valves, seals, unloader components, etc and successfully repaired any “off” brand, cheap axial pump(s) for a gasoline engine pressure washer?

The crankcase locked up on the horizontally-mounted Annovi Reverberi (AR) RMV 2.5G30 axial pump for my old pressure washer yesterday. The seal at the pump crankcase input blew out and the leaking oil is filled with metal.

Evaluating replacement pump options. Have not decided how much I am willing to spend; nor have I decided whether to purchase another axial. The Honda GC 190 for my pressure washer could probably power a small triplex pump. A CAT triplex is not a consideration, but a small Canpump triplex at $230 is. Some internet searching did not yield any information about availability of replacement internal parts for a $60 YAMATIC 3/4" Shaft Horizontal Pressure Washer Pump from Amazon. It is an option if I pursue a super “cheap” replacement. Am curious whether any forum members have had any success servicing this or similar cheap units and whether they considered repair worth the time and expense.

 

[CarLuver]

i changedthe seal on my Ar pump. got the seal at all places Grainger. i have bought a few of the cheap chinese pump and have not killed on yet . one thing i do before i install is to drain the oil out of them and replace it with a good quality oil. the oil they put in them seem like mineral oil.

with these pumps it mostly about engine rpm . to get the max pressure the engine rpm has to be up there . buy a gauge to install in between the gun and hose and see what pressure its really putting out

 

[ctechbob]

I've gambled on the cheap Chinese replacement pumps before. Still working well for me a couple years later. If it breaks, I'll probably spend another $50-60 and just replace it again. Never even think about pulling it apart and replacing parts.

Granted, mine is the cheapo vertical pump, not a nice triplex.

 

[Donald]

Get a new pump. They are cheap enough.

 

[hit_4_show]

Get a new pump....

I intend to do that. It was not my intent to inquire about repairing the existing pump, but only about pump head repairs of cheap, axial replacements. I cannot even find a parts diagram for the version of my bad AR RMV pump, and the current “D” version pump diagrams do not seem to match what I see when inspecting the broken crankcase.

However, the limited response in this thread thus far indicates considering a cheap, replacement, axial pump as primarily a consumable not worth repairing.

 

[Donald]

I intend to do that. It was not my intent to inquire about repairing the existing pump, but only about pump head repairs of cheap, axial replacements. I cannot even find a parts diagram for the version of my bad AR RMV pump, and the current “D” version pump diagrams do not seem to match what I see when inspecting the broken crankcase.

However, the limited response in this thread thus far indicates considering a cheap, replacement, axial pump as primarily a consumable not worth repairing.

AR is a good pump manufacturer of pumps.

But understand all pressure washers with vertical shaft engines and axial pumps are budget ones.

The higher quality pumps are horizontal shaft engines with bolted on or belt driven pumps.

 

[meep]

I spent on a good CAT pump a few years back. $450. Kept a strainer on the front, used pump saver every time. Used 3-4 times per year. It damaged a cylinder in year 3 or 4, which left me pretty disappointed. I took excellent care of it.

 

[Donald]

I spent on a good CAT pump a few years back. $450. Kept a strainer on the front, used pump saver every time. Used 3-4 times per year. It damaged a cylinder in year 3 or 4, which left me pretty disappointed. I took excellent care of it.

Could you have let it run more more than a few minutes without trigger being pulled?

 

[hit_4_show]

I spent on a good CAT pump a few years back. $450. Kept a strainer on the front, used pump saver every time. Used 3-4 times per year. It damaged a cylinder in year 3 or 4, which left me pretty disappointed. I took excellent care of it.

That is quite disappointing.

 

[nbpt100]

The replacement AR pumps are close to $100 now. Some are more. But still likely your best bet. If you open it up and you see alot of white alum corrosion, definitely replace it. On some you can buy the pump piston section and keep the upper part with the cam. That may be a good option. But make sure there is no water in the pump oil. It turns greyish if water gets in it. That suggests you need to replace the water seals. The replacement AR pump I purchased was labeled to use SAE 90 oil. I used at Non- Detergent 10w-30 and it actually ran better. It use to produce sub normal pressure at start up until it warmed up . Now it produces full pressure from the start.

 

[Donald]

My current gas pressure washer is a used horizontal shaft engine & frame I I bought for $50 or so and a new pump I bought by mistake 10 years ago. It does everything I need which is mainly to run a surface washer over my concrete walkway. Maybe vinyl fencing.

I have an electric one for cars or wood deck.

My wife cannot believe I only have two pressure washers. Usually I have 3 or 4 of things. Often in various states of repair.

 

[meep]

Could you have let it run more more than a few minutes without trigger being pulled?

Unlikely - I would keep the trigger tied in place and just idle down the rpm if I needed to pause.