General Troubleshooting Tips - Mec 4069RT Service And Parts Manual

G T
ENERAL ROUBLESHOOTING
H
YDRAULIC
The Hydraulic Drive Pump used in this model is a Variable Displacement, Axial Piston
type pump. Proper adjustment is critical for normal operation of the machine. Refer to
Section 1 of this manual.
Common Causes of Electrical System Malfunctions:
• Battery connections are loose or corroded
• Battery is not fully charged.
• Emergency Stop buttons are pushed (OFF position).
• Circuit breaker is in the tripped (OFF position).
Common Causes of Hydraulic System Malfunctions:
• Hydraulic fluid level is too low.
• Mixed incompatible hydraulic fluids, destroying the additives and causing varnish build-up
and sticking valves.
• Water in the hydraulic fluid due to damp climate.
• Improper hydraulic fluid. Viscosity too high in cold climates. Viscosity too low in warm cli-
mates.
• Hydraulic fluid contaminated with debris--filter change interval neglected, or debris intro-
duced into the hydraulic system.
In machines equipped with the optional cold climate package, MEC uses a
multiple viscosity fluid that is light enough for cold climates and resists
thinning in warm climates. Use only the recommended hydraulic fluid.
Substituting with a lower grade fluid will result in pump failure. Refer to
Section 1 of this manual.
Contamination always causes failure in any hydraulic system. It is very
important to be careful not to introduce any contamination into hydraulic
system during the assembly procedures. Please make sure all ports and
cavities of the manifold and cylinders are properly capped or plugged
during maintenance activities.
T
R O U B L E S H O O T I N G
F P
LUID UMP
"4069RT" Service and Parts Manual
- - G
E N E R A L
T
IPS
T T
R O U B L E S H O O T I N G I P S
March 2014
Page 4-3