TROUBLESHOOTING INTRODUCTION - CONTINUED
OPERATIONAL CHECKS (BRAKING AND HYDRAULIC FAN SYSTEM) - CONTINUED
Inspect braking and hydraulic fan pump for damage and inspect hydraulic fan motor for damage.
Ensure fan is operating.
Release parking brake and activate service brakes while machine is moving in both directions. Listen for any unusual
OPERATIONAL CHECKS (HYDRAULIC SYSTEM)
WARN I N G
When servicing this machine, performing maintenance, or disposing of materials such as engine cool-
ant, hydraulic fluid, lubricants, battery acids or batteries, and CARC paint, consult your unit/local
hazardous waste disposal center or safety office for local regulatory guidance. If further information is
needed, please contact The Army Environmental Hotline at 1-800-872-3845.
DO NOT disconnect or remove any hydraulic system line or fitting unless engine is shut down and
hydraulic system pressure has been relieved. Tighten all connections before applying pressure. Escap-
ing hydraulic fluid under pressure can penetrate the skin, causing injury to personnel.
At operating temperature, hydraulic oil is hot. Allow hydraulic oil to cool before disconnecting any
hydraulic lines. Failure to follow this warning may result in injury to personnel.
Lubricating/hydraulic oils used in the performance of maintenance can be very slippery. Immediately
wipe up any spills. Failure to follow this warning may result in injury to personnel.
To prevent injury to personnel, wear protective eye covering and gloves.
C AU T I O N
Wipe area clean around all connections to be opened during removal. Cap lines and hoses and plug open-
ings after removing lines. Contamination of system could result in premature failure.
N OT E
Tag hoses prior to removal to ensure correct installation.
Use a container to catch any fluid that may drain from hoses or system. Dispose of fluid IAW local pol-
icy and ordinances. Ensure all spills are cleaned up.
Many of these problems can create diagnostic or event codes in ET. These codes can help find root
cause of problem. ET should be used to retrieve logged and active codes.
When you diagnose a problem in braking and hydraulic fan system, a visual inspection of system is
first step. Before any tests are performed, visually inspect entire hydraulic system for oil leaks and
Operational checks can be used to find leaks in system or a bad valve or pump. Rod movement speed
can be used to check condition of cylinders and pump.
Three green bars, dead center on the gage reflects 140°F (60°C).
Check oil temperature. If hydraulic oil temperature is less than 140°F (60°C), then stall boom down for 60 seconds in
order to raise hydraulic oil temperature.