Zoomlion ZT20J, Service And Maintenance Manual

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3-4
bearings cannot be rotated.
b) If the bearing race and the steel ball (or roller) are sunken, scratched or burnt, scrap the bearing;
c) If the bearing is still serviceable, apply a layer of oil and wrap it in clean paper (or wax paper). Do
not open the reusable or new bearing packaging until you are ready to install it.
d) Lubricate the new or refurbished bearings before installation. When pressing the bearing into the
cage or bore, apply pressure to the outer bearing race. Apply pressure on the inner race when
installing the bearing on the shaft.
3.2.8 Washer
Check if holes in the washer are aligned with the opening of the fitting. Hand -made washer
should be made of washer material or stock material of the same material and thickness. Open the
hole in the correct position. Otherwise the washer will not seal properly and can seriou sly damage
the system.
3.2.9 Bolt and torque applications
a) Use bolts of the appropriate length. If the bolt is too long, the bolt will bottom out before the bolt
head is tightened onto the corresponding part. If the bolt is too short, there will not be enough
threaded parts to bite the fixed part. When replacing bolts, only bolts of the same or equivalent size
as the original bolts may be used.
b) In addition to the specific torque requirements given in this manual, standard torque values shall be
applied to heat-treated bolts, studs and steel nuts in accordance with the recommended factory
practice (see torque tables in Section 2).
3.2.10 Hydraulic line and electric wiring
When hydraulic lines and electrical wiring are removed from the equipment, they should be clearly
marked on the hydraulic lines and electrical wiring and their sockets for proper re-installation.
3.2.11 Hydraulic system
a) Keep the hydraulic system clean. If metal or rubber particles are found in the hydraulic system,
immediately drain and flush the entire system.
b) Remove or reassemble parts on a clean operating surface. Clean all metal parts with a
non-flammable cleaner. Lubricate the parts as needed to help the assembly.
3.2.12 Lubrication
Please lubricate the relevant parts at the specified intervals, use the quantity, type and grade of lubricant
recommended in this manual. If there is no recommended lubricant, consult local supplier for equivalent
lubricant that meets or exceeds the listed specifications.
3.2.13 Battery