HYDRAULIC OIL OVERHEATING

TM 9-2320-285-24-1

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

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

7. HYDRAULIC OIL OVERHEATING

WARNING

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

severe injury.

Step 1.

Remove hydraulic reservoir filler cap and check oil level.

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 2 below.

WARNING

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

severe injury.

Step 2.

Remove hydraulic reservoir filler cap and check for contaminated oil.

a. If hydraulic oil is contaminated (oil feels gritty, has milky color, is dark and thick, or smells

scorched), drain and flush hydraulic system and replace oil filters (para 2-78c and 2-78b(1)).

b. If hydraulic oil is okay, notify direct support maintenance.

8. HYDRAULIC RESERVOIR OVERFLOWS

WARNING

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

severe injury.

Remove hydraulic reservoir filler cap and check oil level.

a. If oil level is above bottom of filter screen and fifth wheel boom is down fully, drain (para 2-78c).

b. If oil level is correct, fifth wheel boom was lowered without enough pump speed (air was drawn

into top of lift cylinders, causing hydraulic reservoir to overfill). Move fifth wheel boom through

several full cycles, then fill reservoir to bottom of filter screen (para 2-78c).

2-866