TM 9-2330 -326 -14&P
LANDING GEAR OPERATI NG, MAINTENANCE, AND REP AIR PROCEDURES (CONT.)
Landing gear jackshafts and/or shift shaft binding.
Bent retracting screw. Replace entire retracting leg assembly.
Replace the entire leg if these defects are found.
Right -hand leg (gearbox leg) operates but left -hand leg does not move. Broken cross
driveshaft bolt or damaged cross driveshaft. (Replace)
Legs will not operate when turning jackshaft. Damaged pinion or bevel gear.
Right -hand leg will not operate; shift shaft will turn but jackshaft does not turn. Damaged
input, idler, and/or output gear.
Leg locked and will not turn. Bent retracting screw or damaged riser nut and screw.
Replace entire retracting leg assembly.
Right -hand leg will not stay fully shifted in low gear. Shift lock ball and shift lock spring
missing or damaged shift lock spring.
Noisy gearbox. Check that shift shaft movement is 1 in. (2.54 cm) when shifted between
Landing gears are designed to meet T.T.M.A. recommended practice
RP-4 and A.A.R. -931 requirements.
When operating the landing gears, it is necessary to observe some
cautions. By doing so you will insure long trouble-free service by
observing the following:
Do not over extend or over retract landing gears.
Never drop semitrailer on landing gears. Always extend landing gears until shoes
contact ground, then lift semitrailer approximately 1 in. (2.54 cm) before removing
tractor from semitrailer.
Always chock tires front and rear prior to coupling.
Always insure that the landing gear shoes or footpads will rest on hard ground
surface or concrete pad. If necessary, place shoes on a support plank to prevent
the landing gears from sinking into the ground surface. (This is especially
important with liquid cargo where a shift in the contents could overturn the
semitrailer.) Use ground boards to insure correct/safe couplingheight and prevent
shoes from sinking in soft ground.