WAGNER PP119, Owner'S Manual

Figure 23 -  

Pump section replacement 

instructions

Kit Part Number 0418716

Danger

Always wear protective eye wear while servicing the pump.  Be sure to follow the Pressure Relief Procedure  when shutting 

the unit down for any purpose, including servicing or adjusting.  After performing the Pressure Relief Procedure, be sure to 

unplug the unit before servicing or adjusting.  Area must be free of solvents and paint fumes.

Disassembly of the Pump Section 

  1.  Remove the suction set.
  2.  Remove the front cover and the three screws that secure it 

using a T20 Torx head driver.  

  3.  Remove the yoke screw (1) and washer (2) that secures the 

dowel pin (3).  The dowel pin connects the yoke (4) to the 

piston (5).

  4.  Using a pliers, pull the dowel pin out.
  5.  Inspect the yoke assembly and piston. In order to remove all 

the necessary parts, the piston must not be in the bottom 

dead center position.  If the piston is at the bottom of the 

stroke, install the front cover and screws, turn the pump on 

briefly to index the piston, unplug the unit, and repeat step 2.

  6.  Unscrew and remove the inlet valve assembly (6).  
  7.  Remove the piston assembly by pushing down on the piston 

near the yoke.  

  8.  Unscrew and remove the top nut (7) using and adjustable 

wrench.  

  9.  Remove the worn seals using a flat head screwdriver or punch.  

Remove the top seal (8) from the top and the bottom seal (9) 

from the bottom by pressing against the side of the seal and 

popping it out.  Be sure not to scratch the housing where the 

seals are located.

  10.  Clean the area where the new seals are to be installed.

Assembly of the Pump Section

  1.  Lubricate the new top seal (8) with Separating Oil or light 

household oil and by hand place the seal (cup side of seal 

down) into the top port of the housing.

  2.  Place a small amount of bearing grease on the threads of the 

top nut (7).  Place the top nut into the top of the housing and 

tighten with an adjustable wrench.  This will drive the top seal 

into the correct position.

  3.  Turn the pump upside down.  Lubricate the seal on the piston/

seal assembly (5, 9) similar to the top seal.  Place the piston/

seal assembly into the bottom of the housing.

i

DO NOT attempt to remove the bottom seals from the 

new piston.

  4.  Insert the insertion tool (10) and thread into position to 

properly seat the piston/seal.  Thread fully until tight.  Remove 

the insertion tool.

  5.  Install the new O-ring (11) on the inlet valve assembly, 

lubricate with Separating Oil or light household oil, thread 

into the bottom (inlet) of the housing, and tighten with an 

adjustable wrench.  This will drive the bottom seal into the 

correct position. 

  6.  Align the piston (5) with the yoke (4).  Be careful not to 

damage the piston.

  7.  Apply a bearing grease to the holes in the yoke where the 

dowel (3) is inserted.

  8.  Install the dowel pin (3) to connect the yoke to the piston.  The 

piston may have to be moved up or down to do this.  The inlet 

valve may need to be removed again to move the piston.

  9.  Install the yoke screw (1) and washer (2) to secure the dowel 

pin.

  10.  Turn pump right side up and apply a few drops of Separating 

Oil or light household oil between the top nut (7) and piston 

(5).  This will prolong the seal life.

  11.  Install front cover and three (3) screws.
  12.  Install the inlet valve assembly.  Install the suction set.

Danger

If the supply cord of this appliance is damaged, it 

must only be replaced by a repair shop appointed 

by the manufacturer, because special purpose tools 

are required.

Danger

Do not connect the blue or brown wire to the earth 

terminal of the plug!  The wires in this mains lead 

are coloured in accordance with the following code:
 

blue = live 

brown = live

As the colours of the wires in the mains lead of this appliance 

may not correspond with the coloured markings identifying the 

terminals in your plug, proceed as follows:

•  Should the moulded plug have to be replaced, never re-use 

the defective plug or attempt to plug it into a different 13A 

socket.  This could result in an electric shock.

•  Should it be necessary to exchange the fuse in the plug only 

use fuses approved by ASTA in accordance with BS 1362.  Ten 

(10) Amp fuses may be used.

•  To ensure that the fuse and fuse carrier are correctly mounted, 

please observe the provided markings or colour coding in the 

plug.

•  After changing the fuse, always make sure that the fuse 

carrier is correctly inserted.  Without the fuse carrier, it is not 

permissible to use the plug.

•  The correct fuses and fuse carriers are available from your local 

electrical supplies stocklist.

NEVER

 use a

light socket

Brown to be 

connected to 

L

(live)

Fit the

recommended

fuse

Fit a BS 1363A

approved plug

Blue to be

connected to

N

 (neutral)

Make sure that

the outer sheath

of the cable is

held firmly by the

clamp

12 

PP119