TRUCK IS HARD TO STEER. (Cont) -726250845

TM 9-2320-364-34-1

The truck steering operates with 3000 psi (20,685 kPa) hydraulic pressure. A high pressure hydraulic oil stream

can pierce a body and cause severe injury to personnel. Never disconnect any high pressure hydraulic oil line or

fitting without first dropping pressure to zero.

Damage to main steering pump or hydraulic

pump control will occur if load valve is closed

for more than10 seconds.

NOTE

Use a drain pan to catch spilling hydraulic oil.

PRESSURE TEST

(1)

Open front access cover

(TM 9-2320-364-10).

(2) Remove dust cover from test

point TP2.

(3) Connect a 6000 psi (41,370 kPa)

pressure gage to test point TP2.

(4) Disconnect hose 2393 from MPO

port on steering manifold.

(5) Install a flowmeter in line between

hose 2393 and MPO port on

steering manifold.

(6) Fully open flowmeter load valve.

(7) Start engine.

(a) If 0 psi (0 kPa) are present at

test point TP2 while 280 to 300

psi (1931 to 2069 kPa) are

present on flowmeter, replace

check valve (Para 17-7).

(b) If the pressure measured at test

point TP2 is equal to the

pressure measured at hose

2393, check valve is OK.

(8) Slowly close load valve on

flowmeter until flow drops to 0 gpm

(0 lpm).

(a) If 3000 150 psi (20,685 1034

kPa) are not present when flow

is 0 gpm (0 lpm), adjust hydraulic

pump control (Para 12-2).

If hydraulic pump control adjust

ment does not change the pump

output, perform Steps (9)

through (13) below and replace

hydraulic pump control

(Para 17-4).

(b) If 3000 150 psi (20,685 1034

kPa) are present when flow is

0 gpm (0 lpm), hydraulic pump

control adjustment is OK.

(9) Fully open load valve.

(10) Turn OFF ENGINE switch

(11) Remove pressure/flow valve.

(12) Connect hose 2393 to MPO port on

steering manifold.

(13) Check steering oil level and add oil

as necessary (TM 9-2320-364-20).

2-761