3-21. CHECKS AND ADJUSTMENTS AND FLOWMETER TESTS (CONT)
e. Flowmeter Tests (Cont).
TEST NO. 1 - HYDRAULIC PUMP LOADER SECTION (SHEET 4 OF 4)
(19) Open PRESSURE VALVE control completely and turn off engine.
(20) If flow recorded in step (16) above is less than 52 gallons per minute:
(a) There is an air leak or restriction between hydraulic pump and reser-
voir; change hydraulic filter, and check hoses, lines, and fittings
(refer to TM 5-3805-262-20).
(b) Loader section of hydraulic pump is worn or damaged; replace hydraulic
pump (page 3-612).
(21) If flow recorded in step (16) above is 52 gallons per minute or more,
lines between pump and reservoir are okay.
(22) If flow recorded in step (18) above is less than that recorded in step
(16), it indicates that loader section of hydraulic pump is worn or dam-
aged. Determine efficiency of loader section as described below.
Divide flow recorded in step (18) above by flow recorded in step (16)
above. Example: flow recorded in step (16)=52 gallons per minute; flow
recorded in step (18) above=46 gallons per minute.
46/52=.884=88.4 percent efficient.
(23) If efficiency as determined above is below 75 percent, replace hydraulic
pump (page 3-612).
Hydraulic system pressure is over 2000 psi and hydraulic reservoir is
pressurized with compressed air. Before loosening or disconnecting any
hydraulic hoses, lines, or fittings, operate all hydraulic control
levers to relieve hydraulic system pressure. Failure to do so could
cause serious injury or death. If you are injured obtain medical
(24) Remove cap (8) and plug (9) installed in steps (4) and (5) above from
inlet hose (3) and tube (2). Connect inlet hose (3) to tube (2) and
tighten tube fitting.
(25) Reinstall two clamps (7) and secure using two capscrews (6), lock washer
(5), and nuts (4).
(26) Perform test no. 2 below (page 3-631).