Case 721G Stage IV, Operator'S Manual

Page: 399 / 522

7 - MAINTENANCE
Door hinges
Use graphite to lubricate all hinges. DO NOT use oil.
Plastic and resin parts
When cleaning the plastic windows, the console, the in-
strument panel, the indicators, etc. do not use gasoline,
kerosene, paint solvents, etc. Only use water, soap and
a soft cloth.
The use of gasoline, kerosene, paint solvents, etc. will
cause discoloration, cracks or deformation of these
parts.
Checking for cylinder leakage
A cylinder rod should be slightly oily. Check that there
are no leaks after a period of work, when the whole
hydraulic system is at normal operating temperature.
1. Wipe the rod and bearing clean on the cylinder to be
checked.
2. Operate normally for five or ten minutes.
3. Extend the cylinder rod.
4. Carry out the leak test.
Rod Appearance Test Conclusion
Dry
Slight traces of oil when a piece of
paper is wiped over
20 cm ( 7.9 in ) of
the rod.
Normal
Slightly greasy
Paper remains stuck to rod when run
over rod.
Normal
Oily
Paper remains stuck when placed on
rod.
Normal
Very oily or weeping
Each time the cylinder rod is
extended, a ring of oil can be seen
on the rod.
Leakage
Each time the rod retracts, the excess
oil drips from the gland.
See your dealer
Fire extinguisher (Optional)
It is strongly recommended that a fire extinguisher be
kept on the machine.
Maintenance specifications
Every month Examine the fire extinguisher and make sure it is not damaged.
Every year Have an approved specialist examine the fire extinguisher.
Every six year
Have an approved specialist empty and refill the fire extinguisher.
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