Hc-12Nexstar Iii, Cartridge Maintenance - Vanguard CPW 125-4-S Series Operation And Maintenance Manual

7.7 HC-12NEXSTAR III, CARTRIDGE
Use the following procedure to inspect the cartridge for proper operation.
1. Clean the area around the valve spool before it is removed from the valve bank.
2. Remove the valve spool from the valve bank. Be careful not to touch any surrounding objects.
3. Use any off-the-shelf automotive brake cleaning fluid to remove any visible debris from the valve spool. Wear skin
and eye protection while spraying the valve spool clean.
4. Inspect the O-rings for damage. Replace if necessary.
5. Dip the valve spool into fresh hydraulic fluid to lubricate and fill the cavities.
6. Install the valve spool into the valve block.
7. Validate the operation of the crane related to this valve spool.
MAINTENANCE
VERIFY MOVEMENT IN PORTS WHILE
MANUALLY OVERRIDING CARTRIDGE
Table 8. Cartridge Maintenance
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