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Inspection and Maintenance Procedures
Inspection and Maintenance
For additional information on the fuel gas stop ratio and control valve, refer to the Service Manual under
the Fuel System tab.
HIGH PRESSURE CONTROL OIL SYSTEM — HYDRAULIC SUPPLY
Main Hydraulic Supply Pump
Visually inspect the pump for seal leakage at the shaft and mounting flange. Check the pump for noise
and vibration. Check the inlet and discharge connections for leakage and/or loose connections.
To assure trouble free pump operation and a trouble free hydraulic system, it is important to maintain
the system in a clean condition. Sludge, water, dirt or contaminants of any kind are potential for trouble.
Auxiliary Hydraulic Supply Pump
Maintenance is limited to pump operations such as leaks or sticky valves which do not require a complete
system, or pump, teardown. First, tighten all screws or fittings around the leakage area. If the pump still
leaks, it may be necessary to replace a gasket, or "O" ring.
If the pump does not operate properly, or if there is evidence of damage, it should be overhauled in accor-
dance with the instructions in the Service Manual under the Hydraulic Supply System tab.
Before reassembly, make sure that all parts are clean and free from lint or other foreign matter. All parts
must be washed in cleaning fluid, such as Stoddard solvent (or equivalent). All "O" rings and gaskets
should be clean and carefully examined for cuts and other damage. Replace all damaged parts.
Hydraulic Supply Manifold
Leakage problems on the manifold will generally result from damaged "O" rings between the compo-
nents and the manifold plate. Care must be used in reseating a part to the manifold to avoid pinching or
otherwise damaging the seals.
All tubing connections and device connections should also be checked for leakage. The manifold should
be cleaned and wiped down. This will help in detecting any further leakage problems.
Air Bleed Valve(s)
The air bleed valve(s) should automatically bleed any air present in the discharge lines as the pump is
started. As soon as the system reaches 35 psig (2.41 bars) and a steady stream of oil is present, the valve
should close.
Accumulator
Replace accumulator safety disc annually. To assure that precharge pressure is available and the accumu-
lators can provide the necessary transient flow and shock absorbing characteristics for the system, the
accumulator precharge pressure should be checked periodically and at a minimum of once a year.
The precharge of the hydraulic accumulators should be within 25 psig (1.72 bars) of that specified in
the Device Summary. This check should be done with the unit at standstill. Operation of the main, or
IMP–12
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