NPK M20C, Инструкция по эксплуатации, Страница: 93 / 152

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CYLINDER INSPECTION AND MAINTENANCE
INSPECTING AND CLEANING CYLINDER COMPONENTS
The prevention of foreign contaminant damage is critical when working with hydraulic
equipment. Keep the work area clean. Using masking tape, cover all exposed holes
and parts which may allow entry of foreign contaminants. Habitually clean the work
area by wiping with a lint-free dry cloth.
Mating surfaces are machined to a smooth surface. Use care to avoid scratches, nicks,
dents, or other damage to machined surfaces. If damaged, the component must be
repaired or replaced as required.
1. Inspect the heads and threads of all fasteners and plugs and corresponding
threaded bores for damage. Repair or replace as required.
2. Inspect all components, particularly machined surfaces, including all hydraulic ports,
for evidence of scratches, scoring, nicks, dents, wear, deformity, or other damage.
Particularly close attention should be given to o-ring grooves and counter bores.
Repair or replace as required.
3. Inspect drained and residual hydraulic fluid for evidence of contamination. If
contaminated, inspect all components, seal, etc., to determine the cause.
4. Inspect the cylinder housing (c4) bore. Lightly hone using a ball hone (t17). If there
is heavy scoring, the cylinder housing will need to be replaced.
5. Inspect the bronze guide (c10) found in the cylinder end cap (c5) for damage or
excessive wear.