Eaton PVM018 Service Manual - Assembly

EATON  PVM Piston Pump Service Manual  E-PUIO-II001-E4  December 2017

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Assembly must be conducted in a clean environment. 

Dispose of leakage oil and oily cloths in an environmentally 

responsible manner. Before assembly process can begin, all 

parts have to be initially demagnetized and carefully clean 

all parts and blow out holes with compressed air. Tighten all 

screws plugs to the specified torque (see Appendix). Excep-

tions are specified in the text. Lubricate O-rings and shaft 

sealing rings lightly with acid free lubricant for easier installa-

tion and to hold the O-ring in place in its groove or cavity.

1. Assembly of the Rotating Group

2. Control Sleeve and Control Piston

Note: Extreme care should be taken when installing the major and minor 

diameter O-rings and backup-rings. The minor OD seals are installed in 

reverse order to the major OD seals.

3.  The Control Sleeve and Piston Sub-assembly to the 

  Swash Plate

For fixed hold down assemblies (57cc to 141cc):

•  Place the swash plate with the control piston/sleeve 

  attached face down on the rotating group shoe faces. 

  Invert the swash plate and rotating group, install the 

  spacers, spacer limiter plates (bronze side towards the 

  spacers) and retaining screws.

Note:  Torque the retaining screws to the specified torque

For Spherical Hold down Assemblies (18cc and 45cc):

•  Install the pin into the seat with the pin partially coming out  

  of the flat part of the seat. Set the flat side of the seat 

  against the swash plate and press the pin through the seat 

  into the swash plate.

Note: The pin should be pressed flush or slightly below flush the surface of 

the seat. A roll pin punch or a pin setter can be used to properly position the 

pin into the spherical seat.

Assembly