Repair or replace leaking hydro pump older Lazer z 60

C

Cfs

Well-Known Member
I am trying to help a friend with his Laser z 60_that he uses commercially. It is a model LZ27KC605 serial 602244. Owner thought it was leaking from the hoses and had me replace both hose to the pump. The pump is a Hydro Gear model PJ-8GAB-EY1X. The leak appears to be coming from the charge pump end of the pump. (The opposite end of the driveshaft end). It looks like the leak is coming from the seal where the charge pump bolts onto the main body with two bolts. I have never had one of these pumps apart. I did buy a 70525 seal kit which I have not opened which I can return if unopened. I am hoping that the large rubber o-ring is the problem and that it is possible to remove the two screws that hold the charge pump onto the body and easily replace the o-ring and reinstall the charge pump. I have been able to find a service manual for PJ pumps on line. I assume the pump would be best serviced with the pump removed from the mower? Anyone with any experience on a pump rebuild like this that can provide general information and guidance. Again I have no experience with this type of repair. New pumps run from $700 to $1150 for a pump from Exmark. Being inexperienced I am not sure that there isn't something else leaking further into the pump causing fluid to get to to the area it is ultimately leaking from. Any and all input welcome.
Spit
 
Please verify your pump numbers as Hydro Gear says that number does not exist. Appears to be a PJ-BGAB-EY1X-XXXX with both serial number breaks using the same seal kit..

If it is the charge pump cover o-ring which btw is a Dash 144 o-ring it can charged without fully pulling the pump if have good access to it. Just make you mark the cover position as be reversed and change the pump direction. I also recommend changing the pump cover bolts to 12 pt version as the current one are extremely close and extra thin socket maybe needed.

The Dash 144 [41UK42] are dirt cheap from Grainger. The last time I brought 10 ea they were only $1.90. But shipping is a lot so do a local pickup.

But really you should use UV dye to trace the leak first that way you exactly where the leak is as the housing gasket maybe the source. If that is the case then the pump needs to come out.
 
Also need to look at the charge pump cover itself. Is it cast iron or aluminum. If aluminum it will need to be replaced with the cast iron charge pump kit due to the aluminum cover warping which is what causes the leak.
 
StarTech said:
Please verify your pump numbers as Hydro Gear says that number does not exist. Appears to be a PJ-BGAB-EY1X-XXXX with both serial number breaks using the same seal kit..

If it is the charge pump cover o-ring which btw is a Dash 144 o-ring it can charged without fully pulling the pump if have good access to it. Just make you mark the cover position as be reversed and change the pump direction. I also recommend changing the pump cover bolts to 12 pt version as the current one are extremely close and extra thin socket maybe needed.

The Dash 144 [41UK42] are dirt cheap from Grainger. The last time I brought 10 ea they were only $1.90. But shipping is a lot so do a local pickup.

But really you should use UV dye to trace the leak first that way you exactly where the leak is as the housing gasket maybe the source. If that is the case then the pump needs to come out.
Click to expand...
Star Tech Yes the correct model number for the pump is PJ-BGAB-EY1X-XX its right on a tag, guess I misread the B as a 8 as I said earlier I did buy a seal kit which I hope to return if I only need an o-ring. The kit part number 70525 has a large label that lists the contents of the kit. All of the o-rings and seals are unmarked and are in a clear plastic bag loose. In the descriptions of the contents of the kit I see a -143 and -012 and -134 and a -906 and -009. There is also 2 o-rings listed with Hydro-Gear part numbers 52031and 54022 both of these are described as O-ring Housing. So I am asking if the -144 is the correct size or its a -143.. Or if one of the 2 Hydro-Gear numbers is a -144. I want to order the correct outing just asking for a confirmation not doubting you
 
Well on the IPL item 39 is shown as
1790969629577.png

And this is difference between 143 and 144.
1790969837433.png
 

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StarTech.
One more question on the o-ring. I see that the description that you attached from Hydro-Gear states that it is a square cut o-ring. I do see a square cut o-ring in the rebuild kit not sure if it is the 51016 but it does appear to be about the right size.
What I have seen of the -144 o-ring is that it is a round o-ring. Is it critical that it be square or is the round o-ring an acceptable replacement for the 51016?
Spit
 
The -144 comes in three different designs. Round, X, and Square. With Square providing the best sealing under pressure. There is even a Rectangle version but it is used as a backup for round o-rings.

This is an example how round rings distort under pressure without a backup.
1791035265753.png
 
I am going to pick up the Hydro-Gear 51016 from a dealer tomorrow. I assume it will be square cut. I will let you know how everything works out
 
I picked up a new 51016 square cut -141 O-ring from a local dealer and I waiting for the owner to bring the machine back to attempt the repair. I have never done this repair. It looks tempting to try it without removing the pump from the mower… but would probably be better accessed with the pump removed. My big concern would be the check ball and spring falling out. A couple of questions… 1. Does the ball or the spring go into the pump first. 2. The clearance to get a socket wrench on to the two bolts that hold the charge pump cover on; seemed very limited what have you done/used to remove these bolts. Any and all insights appreciated

Spit
 
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