TM-9-2320-285-24-1
TRUCK TRACTOR, YARD TYPE, 43,500 LB GVW, DED, 4X2, ARMY MODEL M878A1
TECHNICAL MANUAL; ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1985
TM-9-2320-285-24-1 - Page 889 of 987
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
Back to Top
