© Feb. 2023 34 TB20J Plus Maintenance Manual
MAINTENANCE INSTRUCTIONS
8. Take all precautions to keep the hydraulic oil clean.
If hydraulic oil must be poured from the original ves-
sel into another vessel, ensure that the vessel is
kept clean and does not contain any contaminants.
Make sure to clean the filter screen and replace the
filter element when changing the hydraulic system
hydraulic oil.
9. After the machine is shut down, carry out proper
preventive maintenance measures, thoroughly
check all hydraulic components, piping, fittings, etc.,
and check each system for functionality before put-
ting the machine into service again.
Battery
Wash the battery with non-metallic brush and sodium bi-
carbonate aqueous solution, and then rinse with clean
water. After cleaning, allow the battery to dry completely,
and apply the battery terminals with anti-corrosion
compound.
Pins and Composite Bearing
1. The connecting pin should be removed and in-
spected in case any of the following defects is
found:
• Excessively tilted joint
• Noise originating from the joint during operation
2. The composite bearing should be replaced in any of
the following conditions:
• Frayed or separated fiber on the sleeve surface
• Cracked or damaged sleeve housing
• Bearing moved or rotated into the housing
• Debris embedded in the sleeve surface.
3. Replace the pivot pin after any of the following is de-
tected (properly clean the pivot pin before
inspection):
• Wear in the bearing area
• Flaking, pealing, scratches or abrasions on the
pivot pin surface
• Rusty pivot pin in the bearing area
4. Reassemble the connecting pin and composite
bearing
• Blow off the dirt and debris on the housing. Re-
move any foreign objects on the bearing and
housing.
• Clean the bearing and pivot pin with a cleaning
agent to remove all grease and oil. The compo-
site bearing uses dry coupling which does not re-
quire lubrication.
• During installation and operation, inspect the piv-
ot pin to ensure that there are no burrs, nicks or
abrasions that could damage the bearing.
4.3 MAJOR MODIFICATION AND
REPAIR
A major modification/repair is a modification/repair
made to the entire machine or its parts that affects the
stability, strength or performance of the machine.
Each time the machine owner/company makes a major
modification/repair to the machine, it should be recorded
using the Major Modification/Repair Record in the at-
tachment to this manual. Keep the record properly until
the machine is taken out of service, or as required by
the machine owner/company.
Major modifications/repairs to the machine must be per-
formed by a qualified service technician. The machine
must be inspected and verified after major modifica-
tions/repairs, with the inspection items including but not
limited to all items in the Inspection and Preventative
Maintenance Schedule . After all the inspection and
verification results are good, the machine can be put
back into service.
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