What's new

Pump problem

Joined
Aug 18, 2019
Messages
85
Reaction score
10
Points
8
Hey guys I haven’t been on in a while I’ve been stuck out of town for work and it’s hard maintaining a car wash and traveling at the same time but here’s my dilemma. I have general pumps for my hp and one bay is pulsating pretty bad when rigger is pulled. If I let the trigger go it seems to build up pressure. I’ve never rebuilt a pressure washer pump. At work we sometimes work on pumps used for frac and downhole work “oilfield”. So we change out packings. So I removed some of the parts from the general pump just to observe what was inside. I inspected the o rings and the check valves if that’s what they are called and everything looked fine. I reassembled and turned on and same thing. So I found a diagram and a parts list and am curious what you guys think I should replace. I’m thinking I definitely at least need the number 1 kit. Do y’all think I should go ahead and get 3 of the number 29 kits also? Thanks for any help y’all.

On a side note what should I do to maintain these pumps. Should I do a schedule and replace them let’s say every year or wait until I have an issue and rebuild them then?
 

Attachments

MEP001

Well-known member
Joined
Aug 30, 2007
Messages
12,375
Reaction score
702
Points
113
Location
Texas
Here's the correct data sheet:


It probably needs a seal kit. Be sure to inspect inside the manifold for washout where the seals sit. There's not a kit for just the seal parts, so you'll need a kit 148, half of a kit 11, and three 90.3616.00 o-rings. The valves almost never fail but the plastic cages tend to deform. I replace them if the valve doesn't stay together. You can throw in three kit 29's but those brass parts included in them don't usually go bad. You can save that money for a seal extractor tool in case you need it.

If you rebuild the pump immediately at the first sign of pulsation or weak pressure, you most likely won't have a problem, but it's important that the pump isn't running faster than it needs to. Keep in mind that if you're running 3 GPM at the bay but the pump is moving 4.5 GPM, that's 1-1/2 gallons per minute moving through a bad seal before there's a loss in pressure, which will erode and ruin the manifold.
 
Joined
Aug 18, 2019
Messages
85
Reaction score
10
Points
8
Here's the correct data sheet:


It probably needs a seal kit. Be sure to inspect inside the manifold for washout where the seals sit. There's not a kit for just the seal parts, so you'll need a kit 148, half of a kit 11, and three 90.3616.00 o-rings. The valves almost never fail but the plastic cages tend to deform. I replace them if the valve doesn't stay together. You can throw in three kit 29's but those brass parts included in them don't usually go bad. You can save that money for a seal extractor tool in case you need it.

If you rebuild the pump immediately at the first sign of pulsation or weak pressure, you most likely won't have a problem, but it's important that the pump isn't running faster than it needs to. Keep in mind that if you're running 3 GPM at the bay but the pump is moving 4.5 GPM, that's 1-1/2 gallons per minute moving through a bad seal before there's a loss in pressure, which will erode and ruin the manifold.
Where do you recommend getting these parts from?
 

MEP001

Well-known member
Joined
Aug 30, 2007
Messages
12,375
Reaction score
702
Points
113
Location
Texas
Windtrax if you're signed up for their free shipping. Kleen-Rite's prices are a little better but shipping from them is getting out of hand, and they'll most likely send you some of the parts and backorder the rest so you'll get double-dinged on freight. Windtrax (and most other suppliers) will follow your instructions if you ask them to ship the order complete.
 
Joined
Aug 18, 2019
Messages
85
Reaction score
10
Points
8
Windtrax if you're signed up for their free shipping. Kleen-Rite's prices are a little better but shipping from them is getting out of hand, and they'll most likely send you some of the parts and backorder the rest so you'll get double-dinged on freight. Windtrax (and most other suppliers) will follow your instructions if you ask them to ship the order complete.
Awesome thanks as always MEP. I’m interested in expanding this location and installing a mini and Also I’m looking to expand on purchasing another car wash in a neighboring town. So I’m not going anywhere and you will see more posts from me in the future.
 

traveler17

Member
Joined
Nov 5, 2019
Messages
56
Reaction score
21
Points
8
Location
SE NC
You can also call a GP tech. Very helpful years back when I replaced a hp seal kit. #651-454-6500
 

MEP001

Well-known member
Joined
Aug 30, 2007
Messages
12,375
Reaction score
702
Points
113
Location
Texas
You can also call a GP tech. Very helpful years back when I replaced a hp seal kit. #651-454-6500
I am every bit as qualified as anyone at that number, as I was factory trained in GP service and have rebuilt many hundreds of them.
 
Joined
Aug 18, 2019
Messages
85
Reaction score
10
Points
8
I am every bit as qualified as anyone at that number, as I was factory trained in GP service and have rebuilt many hundreds of them.
Hey MEP where do you recommend me getting the extractor tool and what size wil I need? I found a kit that does like 13mm to 24mm will that work? I took the pump apart and this is what I found. Nothing looks washed to me.
 

Attachments

Rfreeman

Active member
Joined
Aug 4, 2014
Messages
343
Reaction score
77
Points
28
Location
Ft. Worth
Fast hard to tell from the pictures if you have any wash out in that pump head or not. But here is a pic from my cat head where its easier to see. For comparison I added a resleeved head as well. You want a nice smooth surface so the seals sit in there nice in clean
 

Attachments

MEP001

Well-known member
Joined
Aug 30, 2007
Messages
12,375
Reaction score
702
Points
113
Location
Texas
It would be washed out under the valve o-rings (Probably not since the o-rings are intact) or where the packings seat. You haven't removed the packings, sometimes you can just pull them out by hand, but if they're corroded in you need the extractor.


 
Joined
Aug 18, 2019
Messages
85
Reaction score
10
Points
8
It would be washed out under the valve o-rings (Probably not since the o-rings are intact) or where the packings seat. You haven't removed the packings, sometimes you can just pull them out by hand, but if they're corroded in you need the extractor.


Yeah those suckers are in there. I’ll order the extractor kit tonight and get them replaced and I’ll probably go ahead and order new packings for my other 5 pumps and replace just to have a baseline of when they have all been replaced and serviced.
 
Joined
Aug 18, 2019
Messages
85
Reaction score
10
Points
8
Ok so I replaced all the soft seals and the check valves and it does the same exact thing. I’m going to switch the unloader/regulator with another known good one and see if that helps any. It’s almost as if it’s starving for water. Once weep is primed up it sprays without any pulsation but once the trigger is pulled it sprays hard and pulsates a second or two later. Any advice would be greatly appreciated.
 

Attachments

Last edited:

MEP001

Well-known member
Joined
Aug 30, 2007
Messages
12,375
Reaction score
702
Points
113
Location
Texas
Fix this leak first. It could be your whole problem.

7ACDB2A5-017C-4EA8-BD15-5A0DA332BAB1.jpeg
 
Top