When

To replace a support ring

Tools required

  • Screwdriver, Torx T30

  • Seal-handling tool

12123
Figure: Seal-handling tool (left: closed tool; right: open tool)

No.

Description

1

Removal pin

2

Insertion pin

3

Knurl for opening and closing the seal-handling tool
(opening and closing is required only when using the removal pin)

Preparations

  1. Remove the pump head. See Removing the Pump Head.

  2. Remove the piston for which you want to replace the support ring. See Removing the Pistons.

Parts affected on the pump head

124563
Figure: Support ring (here: for left piston)

No.

Description

1

Pump head

2

Support ring

3

Pump head seals (for seal wash plate and seal wash plate screws)

4

Seal wash plate

5

Screws, seal wash plate (4 screws)

6

Piston

Follow these steps

  1. With the screwdriver, remove the screws on the seal wash plate.

  2. Figure: Screws on seal wash plate (here: left plate)
  3. Remove the seal wash plate from the pump head.

  1. If one or more pump head seals come off when you remove the seal wash plate, keep them for reinstallation.

  1. Remove the support ring: Push the insertion pin of the seal-handling tool at a slight angle into the pump head. Do not use the removal pin.

Figure: Support ring (here: for left piston)
  1. Remove the tool. The support ring is removed together with the tool.