Maintenance; Changing Hydraulic System Fluid - prime mover smx45 Master Service Manual

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2. Maintenance

To prolong the life of the truck, keep all fittings and
connections tight to prevent leaks. To avoid damage or
distortion, do not over-tighten brass fittings. Before removing
any component from the hydraulic system, wash the
component and surrounding area with cleaning solution to
prevent foreign matter from entering the system. Cap and
plug all openings immediately. Whenever removing fitting
with a pipe thread, use a sealing compound on the
outside of threads before reinstalling. (Do not use
®
Teflon tape.) Make sure all parts are clean. When installing
a hose assembly, make sure that it is not twisted when fittings
are tightened. Always use two wrenches on a swivel-type
fitting, one to hold the fitting and the other to tighten the hose.

2.1. Changing Hydraulic System Fluid

Hydraulic fluid level must be checked periodically (see
"Planned Maintenance Schedule" on page
reservoir regularly requires additional oil to maintain proper
level, a leak is indicated and must be repaired. When
scheduled, the reservoir should be removed and drained for
cleaning and replaced with new oil. After refilling, check lift,
lower and other hydraulic functions for proper operation. If the
truck will not lift a full load, the pressure relief setting should
be checked and adjusted. During normal operation, pressure
relief setting will not change. As the lift pump wears with age,
some loss of performance will be experienced. When this loss
becomes severe, the lift pump should be replaced.
Fluid is under pressure and may spray or
WARNING
splash. Point hose away from you body and
hold firmly in waste fluid container.
NOTE! Be sure truck is in a clean area, away from
possible contaminating elements that could
enter the hydraulic system during the
changing process.
Contaminated hydraulic fluid is the major cause of
hydraulic system failures. Keep any service equipment,
such as containers, funnels, and hand pumps clean at all
times by covering when not in use.
Master Service Manual 2006-08-08
F-code Section
PT S6.0
Hydraulic System
Version no T-code
001 SMX
C-code
6000
61.) If the
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