Large closed type

TM 38-260

preserved with hydraulic fluid, conforming to that which is specified in the operators manual. In cases where the fluid

specified in the operators manual is unavailable, use fluid corresponding to MIL-H-5606 or MIL-H-6083. If a deficiency is

found to exist, it should be identified and recorded on DD Form 1342 or other applicable inspection documents.

(2) Large closed type. In the event disassembly is necessary, the valve connecting the reservoir to the

assembly should be closed to retain the operating oil within the reservoir. Cleaning and preserving shall be

accomplished in accordance with (1) above. Operating hydraulic oils with a petroleum base will have basically the same

preservative qualities as preservative oil P-10 conforming to MIL-L-21260. Whenever possible, all hydraulic systems

shall be cleaned and preserved with hydraulic fluid conforming to that which is specified in the operator's manual. In

cases where the fluid specified in the operators manual is unavailable, use fluid corresponding to MIL-H-5606 or MIL-M-

6083. Hydraulic oil shall be tested for contamination by a qualified testing laboratory. The following procedure shall be

followed:

(a)

Cycle the machine for approximately 20 minutes and immediately take a one gallon (3.785 liter) oil sample.

(b) Identify the test sample to the system from which it was obtained (ID and TAG NO.) and test to determine if

an excessive amount of foreign material or contaminants is present and if the level of preservation is adequate.

particles or replaced as necessary.

(d)

Oils failing to meet the corrosion protection specified in MIL-H-5606 or MIL-H-6083 shall be replaced.

NOTE

MIXING OF ADDITIVES OR RUST INHIBITORS IS NOT

RECOMMENDED DUE TO INCOMPATABILITY WHICH

MAY CAUSE JELLING.

(e) If the fluid has been tested and determined to be free of contamination and the preservative qualities are

adequate, the fluid may be returned to the reservoir. The system shall be filled to the operating level with fluid of the

same brand and glade that was previously in the system.

(f)

All filters shall be cleaned and filter elements replaced or cleaned as appropriate.

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