HYDRAULIC SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
RELIEF VALVE (MAIN, LOAD SENSING) TEST AND ADJUSTMENT - CONTINUED
Stop engine (TM 5-3805-291-10).
Ensure control levers are in HOLD position (TM 5-3805-291-10).
To relieve pressure in hydraulic tank (22), press and hold plunger on breaker relief valve (23).
N OT E
Always turn adjustment screw clockwise to adjust pressure. This will compensate for any internal friction
inside main relief valve that would oppose setting of bias spring. For example, if adjustment screw needs to
be turned counterclockwise by 1/2 turn to decrease pressure, turn adjustment screw counterclockwise by
one full turn. Then, turn adjustment screw clockwise by 1/2 turn.
Adjust main relief valve (26).
Loosen locknut (28) and turn adjustment screw (29) clockwise to increase and counterclockwise to decrease pres-
sure setting of main relief valve (26). One turn of adjustment screw will change main relief valve pressure by 190
psi (1,310 kPa).
While holding adjustment screw (29), tighten locknut (28) to 106 ± 18 lb-in. (12 ± 2 Nm).