HYDRAULIC SYSTEM - CYLINDER PRESSURE RELEASE

TM 5-5420-279-23

5 - 123 HYDRAULIC SYSTEM - CYLINDER PRESSURE RELEASE

This task covers:

a. Cylinder Pressure Release

INITIAL SETUP:

Tools Required

Tool Kit, General Mechanic's, Automotive (GMTK)

Materials Required

Clean Cloth

Container to catch hydraulic fluid

Equipment Conditions

As detailed for removing the cylinder under repair.

WARNING

INJURY FROM EXTREME HYDRAULIC OIL PRESSURE. THE SYSTEM MUST BE

DE-PRESSURIZED BEFORE CARRYING OUT ANY WORK ON ANY CYLINDER.

INJURY FROM EXTREME HYDRAULIC OIL PRESSURE. WHEN DE-PRESSURIZING

CYLINDERS IT IS IMPORTANT TO MAKE SURE NO HYDRAULIC OIL CAN BE

SPRAYED. MAKE SURE THAT NO PERSONNEL ARE STANDING NEAR THE

CYLINDER BEING DE-PRSSURIZED.

SLIP AND FALL INJURY. PERSONNEL MAY SLIP ON SPILLED HYDRAULIC FLUID.

SUITABLE CONTAINERS AND FLUID ABSORBENT MATERIALS ARE TO BE USED

TO CONTAIN SPILLAGE.

NOTE

This is a general procedure to be used on any cylinder when required. The steps detailed

in this procedure are applicable to all hydraulic cylinders.

It may be necessary to release the residual pressure in a hydraulic cylinder to assist in its

removal or replacement. Releasing the hydraulic pressure from the cylinder relieves force

acting on the cylinder pins and allows the cylinder piston to be moved.

The cylinder pressure release fitting (2), one at each end of the cylinder (1), are always

located at 90o to the cylinder valve block (3) or line connection (4). The following pictures

shown typical locations.

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