Assembly 1

Spool sections

General

The main components of a section are the main body and spool assembly. These components are modular, allowing combination to be matched to service requirements.

The crowd section contains relief valves. The lift, extend and auxiliary sections are of the same construction but without relief valves.

NOTE: Dismantling and assembly of the spool section describes the section with relief valves fitted. Disregard relief valve information for relevant sections.

Dismantling

1. Remove the screws (1) attaching mechanical handle assembly (2) to the main body (3) and detach from body. Remove and discard the O-rings (4).

2. Remove the screws (5) attaching actuator (6) to the main body (3) and detach from body. Remove and discard the O-rings (18).

NOTE: Dismantling of the spool section is not necessary when the fault is external leakage only.

3. Unscrew the tension rod (7) from the spool (8) and remove O-ring (9), two stops (10) and spring (11).

4. Unscrew the plug (12) from the spool (8) and remove O-ring (13). Carefully slide spool (8) out of main body (3).

5. Remove the pressure relief valves by unscrewing the plug (14), withdraw the O-ring (15), spring (16) and seat (17).

6. Clean the spool and housing in an approved solvent and dry using an air jet, do not use cloths or paper wipes.

7. Clean the pressure relief valves in an approved solvent and dry using an air jet, do not use cloths or paper wipes. 8. Examine the main body and spool for wear, burrs, blocked grooves or other damage. If any damage or wear is found, the main body (3) or spool (8) must be replaced.

NOTE: If a pressure reducing valve is replaced, make sure the correct rated valve is fitted.

9. Examine the pressure relief valves for damage or wear. If any damage or wear is found, the valve must be replaced as a unit.

Assembly

Assemble the spool section in the reverse order to dismantling. Take care not to damage the spool or main body when installing the spool.

Use new O-rings during assembly.