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CHAPTER 2 MAINTENANCE
NMC-WOLLARD
2021 Truax Blvd. Eau Claire, WI 54703 ● P: 715-835-3151● F: 715-835-6625 ● www.nmc-wollard.com
TML-704H Maintenance Lift Manual No. 310547
2 TROUBLE SHOOTING
H16
Power steering
centering spring
broken
With power switch turned off, gently move steering
wheel in both directions. The wheel should always
tend to return to its original position. If not, remove
and repair steering unit as required. (See Mfr’s
data, Chap. 5.)
H17
Power steering internal
check valve blocked
open or damaged
Check system pressure by “bottoming out” lift
cylinder. Operate power steering until wheels stop
turning. If system pressure is below 1,800 psig,
remove and repair power steering unit.
H18
Power steering unit
worn or damaged
Remove, repair or replace. (See Mfr’s data, Chap.
5.)
H19
Brake master or wheel
cylinder seals bad
Remove and repair as required.
H20
Air in brake system
Pressure bleed all brake lines.
H21
Master or wheel
cylinder(s) seized
Remove and repair or replace as required.
H22
Brake fluid
contaminated
Drain system. Refill with new fluid; purge all lines.
Disassemble all components and clean with new
fluid; also replace any damaged/corroded
components. Refill system with fresh fluid.
Pressure bleed system.
H23
Brake fluid level low
Refill with new fluid. Check for leaks. Pressure
bleed system.
H24
Brake linings worn or
out of adjustment
Check condition of linings. Replace and/or adjust
as required.
H25
Brake linings
contaminated (oil, etc.)
Drain system. Refill with fresh fluid. Purge all brake
lines. Disassemble all components and clean with
new brake fluid. Replace any damaged or
corroded components. Reassemble, refill with
fresh, new fluid and pressure bleed system.
Replace linings.
H26
Oil cooler perforated
Pressure test radiator and check for leaks from
cooler. Replace if required.
H27
Oil cooler blocked
Check and replace if required.
H28
Valve locked in Manual
Override position
Push in override knob, turn fully clockwise
until it stops, then release.
H29
Valve stuck in rest
position
Remove and replace
H30
Valve stuck in shifted
position
Remove and replace
SEPTEMBER 01, 2015
Property of American Airlines
