we are new in using schwing pumps, we have 61 m and we want to change the kidney seal and wear ring .is there is any one has usefull information about the service for these parts.

What kind of information are you looking for? Pretty straight forward installation of the kidney seal and such.

If you have a forklift available makes it a lot easier, but its not required.

First, remove the bolt on the back of the rock valve that holds the Shaft in place (Small bolt first -- locking bolt). Then unscrew the large nut that the lock bolt threaded into . Remove and set to side.

Position forklift against rock valve and remove all the bolts holding the rear plate on.

 ------------- if no forklift, remove two of the bolts at first that are in similar areas ( example: 3 bolts up from bottom on LH and RH side). Install long bolts (same thread). and remove rest of the bolts then slide plate out onto the long bolts.

The long bolts are used as alignment bolts to put it back together.

If your using a fork lift, strap the plate to the forks and set the plate to the side.

Using an air chisel, pop the kidney seal out.

Slide the rock valve (OUT) to the rear of the truck slightly, and stick your air chisel inside the rock valve and pop the cutting rings out.

Replace the cutting rings and spring gaskets as a set.

Clean the groove around where the kidney seal is seated, and also the groove around where the spring seal and cutting rings are seated.

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If you really have doubts about it. Please dont hesitate to call Schwing service department. They are a great bunch of guys who are there to help you whenever is needed

Picture below shows the rear plate suspended on the alignment bolts

The rock shown in picture is not the big rock like your 61 probably has, but its all the same in how to change them.. On the E-Rock you'll just have a lot more room to fit an air chisel

small tip when changing the cutting ring and pressure spring duct tape them in position when installing them to avoid it slipping off when putting the other pieces back together

thanks for help we will try to do it 

make sure the kidney seal has the rips as shown in pic above facing to the rear of the pump; dont be skimpy with grease...

You can contact Schwing and order a Service Manual CD. There is a complete section in there on rebuilding the rock valve. Also for future use there would be instructions to set and adjust boom and pumpkit pressures if needed.

Jeff Popa

Technical Service Manager and Spare Parts Specialist

Off – 651/429/0999 X 213

Direct – 651/653/4213

Cell – 612/845/6981

jpopa@schwing.com