Installation of U-Cup Seal with Spacer(s){7555, 7562} Caterpillar

Introduction

This instruction gives the procedure for replacing the Chevron packing in an hydraulic cylinder with a U-cup seal and spacer(s).

NOTE: Use the Chevron packing "part number"when ordering the U-cup seal and spacer(s).

Illustration 1. Hydraulic cylinder with chevron packing.
(A) Chevron packing. (B) Head. (C) Retainer.

Illustration 2. Hydraulic cylinder with the U-cup seal and spacer(s).
(A) Spacer(s). (B) U-cup seal. (C) Head. (D) Retainer.

1. Remove the retainer and old Chevron packing. Keep the retainer for later use. Properly dispose of Chevron packing, see Illustration 1.

2. Place the new U-cup seal between the head and rod, see illustration 2.

3. Place the spacer(s) behind the U-cup seal.

4. Install the retainer that was removed in step 1.

NOTE: There is not a need to put pressure on the seal/spacer(s) to install the new seal assembly. There needs to be a void between the U-cup seal and the head for sealing purposes.