FIFTH WHEEL DOESN'T LIFT (Cont) - TM-9-2320-285-24-10887

TM 9-2320-285-24-1

2-76. FIFTH WHEEL HYDRAULIC SYSTEM TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2. FIFTH WHEEL LIFTS SLOWLY (Cont)

Step 2.

Remove hydraulic reservoir filler cap and check oil level (para 2-78c).

a. If oil level is below bottom of filter screen, fill with hydraulic oil (para 2-78c) until level is at bottom

of filter screen.

b. If oil level is at bottom of filter screen, go to step 3 below.

Step 3.

Check for clogged hydraulic filter elements.

a. If filter elements are clogged, replace (para 2-78b(1)).

b. If filter elements are not clogged, go to step 4 below.

WARNING

Do not remove filler cap when hydraulic oil is hot. Hot oil can cause

severe injury.

Step 4.

Remove hydraulic reservoir filler cap and check for proper viscosity hydraulic oil.

(Compare

thickness of oil to oil from new container of hydraulic oil.)

a. If oil from reservoir is thinner than sample oil, drain and refill hydraulic system and replace oil

filters (para 2-78c and 2-78b(1)).

b. If oil from reservoir is same consistency as sample oil, notify direct support maintenance.

3. FIFTH WHEEL CREEPS DOWNWARD

Step 1.

Check if bleed valve is fully closed (handle in vertical position.)

a. If bleed valve is open, close it fully.

b. If bleed valve is fully closed, go to step 2 below.

Step 2.

Check all fifth wheel lines, hydraulic control valve, and hydraulic cylinders for visible signs of

external leaks.

a. If leaks are seen, repair as required.

b. If no leaks are seen, notify direct support maintenance.

2-864