When

Damage to pump head seals, leaky seals

Parts and tools required

  • Pump head seals

  • Seal wash seals (and seal-handling tool)

NOTICE

All pumps except VC-P21 and VC-P33: Whenever you remove the pump head, you must replace the seal wash seals.

Preparations

  1. Remove the pump head (see Replacing the Pump Head).

  2. Remove the pistons (see Replacing the Pistons).

Follow these steps

  1. Remove the seal wash plate from the pump head if applicable.

  2. Remove the seal wash bodies from the pump head if applicable.

  3. Remove the pump head seals.

Pump head seals
Figure: Pump head seals

No.

Description

1

Seal wash bodies

2

Pump head seal, O-ring 32x1.5

3

Pump head seal, O-ring 9x1.5

  1. Install the new seals.

    Place the seal onto the receiving groove. With your finger on the seal, follow the groove shape until the seal rests exactly in the groove.

  1. Insert the seal wash bodies into the pump head. Mind the correct orientation. The even side faces the pump head.

Orientation of the seal wash body
Figure: Orientation of the seal wash body

No.

Description

1

Side facing the seal wash plate

2

Side facing the pump head (even side)

  1. Replace the seal wash seals (see Replacing the Seal Wash Seals).

  2. Install the pistons. Follow the related steps in Replacing the Pistons.

  3. Install the pump head. See Installing the Pump Head.

  4. Inspect all flow connections on the pump head for indications of leakage. Tighten leaky connections when the system pressure is down to zero.

  5. Test the seal wash system and pump for leakage (see Testing the Seal Wash System for Leakage and Testing the Pump for Leakage (General Test)).