PAGE 2-14
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 o, 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 uid
contaminated
Drain system. Rell with new uid; purge all lines.
Disassemble all components and clean with new
uid; also replace any damaged/corroded
components. Rell system with fresh uid.
Pressure bleed system.
H23 Brake uid level low Rell with new uid. 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. Rell with fresh uid. Purge all brake
lines. Disassemble all components and clean with
new brake uid. Replace any damaged or
corroded components. Reassemble, rell with
fresh, new uid 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
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