4-77. HYDRAULIC PUMP OVERLOAD VALVE ADJUSTMENT (M832 EXCEPT SN J089-001
THRU 159 AND J017-160 THRU 350).
This Task Covers: Adjustment
Dolly set parked on level surface with handbrakes
Common no. 1 shop set
applied (para 2-2).
Dolly set uncoupled from towing vehicle (pare 2-16).
Remove hydraulic line (3) from pipe bushing
(2) in hydraulic pump(1) pressure outlet.
Remove bushing (2) from
Install pipe bushing (5) in
hydraulic pump (1)
hydraulic pump (1) pressur
Install hydraulic test gage (4) in pipe bushing (5).
Make sure pipe bushing and test gage connections do not leek.
Check hydraulic fluid level in hydraulic pump reservoir (pars 3-2).
Operate pump piston lever (9) while reading pressure on test gage(4). Pressure should read 3000psi (20,685
kPa) + 100 psi (689 kPa) prior to opening of overload valve.
When the overload valve releases pressure, the gage pressure reading will
drop off immediately.
If overload valve does not release pressure at 3000 psi (20,666 kPa) + 100 psi
(669 kPa), adjust overload valve.