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Home›Repair guides›Caterpillar›Disassembly of the Counterbalance Valve

Caterpillar 311F LRR EXCAVATOR JFT — Disassembly of the Counterbalance Valve

Repair & overhaul

For the Caterpillar 311F LRR EXCAVATOR JFT, from the Caterpillar service manual.

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Before you start

  • Personal injury can result from being struck by parts propelled by a released spring force. Make sure to wear all necessary protective equipment. Follow the recommended procedure and use all recommended tooling to release the spring force.
  • Note: Remove the remaining allen head bolts from the housing assembly for cleaning purposes, if necessary. Each allen head bolt has an O-ring seal. Check the O-ring seal for wear or for damage.

Procedure

  1. Position the counterbalance valve, as shown. Remove plug (8) and adapter (9).
  2. Remove spring (10) and spool (11).
  3. Remove relief valve assemblies (12).
  4. Remove seat (13). Seat (13) is pressed onto valve (17). Use new parts if seat (13) or valve (17) is damaged. Do not disassemble these components.
  5. Remove backup ring (14) and O-ring seal (15).
  6. Remove O-ring seal (22).
  7. Remove nut (20).
  8. Remove screw (27).
  9. Remove stopper (26). Remove backup ring (19) and O-ring seal (18) from stopper (19).
  10. Remove valve (21), piston (25), and spring (16) from the housing.
  11. Remove backup ring (23) and O-ring seal (24) from piston (25).
  12. Remove covers (28) and the O-ring seals.
  13. Remove springs (29), guides (30), and spool assembly (31).
  14. Remove valve (32), spring (33), and ball (34) from one end of spool (35). Repeat for the other end of spool (35).
  15. Remove plug (36), spring (38), and piston (39) from both sides of the housing assembly.

Source: Caterpillar service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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