© Feb. 2023 32 TB20J Plus Maintenance Manual
MAINTENANCE INSTRUCTIONS
Scrap of Structural Parts
• When certain major structural part fails to meet the
requirements for safe use due to corrosion, wear
and other reasons, it should be repaired or rein-
forced; otherwise it should be scrapped.
• When certain stressed structural part is permanently
deformed and cannot be repaired, it should be
scrapped.
• When certain major stressed structural part loses
overall stability and cannot be repaired, it must be
scrapped.
• When certain structural part or weld is cracked, the
cause should be analyzed and reinforcing measures
should be taken as appropriate for the force and
cracks. Continued use is only allowed if the structur-
al part and weld meet the original design require-
ments, or they should be scrapped.
Pressure-fit Parts
When assembling pressure-fit parts, use anti-seize or
molybdenum disulfide-based compounds to lubricate
the mating surface.
Bearing
1. After a bearing is removed, cover it to avoid dust
and abrasives. Use non-flammable cleaning solvent
to clean bearings and allow them to dry in the
shade. Compressed air can be used, but do not ro-
tate the bearings.
2. If the races and balls (or rollers) have pits, notches
or burn marks, the bearing should be scrapped.
3. If the bearing is still serviceable, apply a coat of oil
and wrap it with clean paper (or wax paper). Do not
unwrap reusable bearings or new bearings until
they are ready for installation.
4. Before installation, lubricate new or serviceable
bearings. When pressing the bearing into the re-
tainer or bore, pressure should be applied on the
outer race. If the bearing is to be mounted to a shaft,
pressure should be applied to the inner race.
Gaskets
Check if the hole in the gasket is aligned with the open-
ing in the mating part. If a handmade gasket is required,
use gasket material or stock of equivalent material and
thickness. Make sure to cut a hole in the correct posi-
tion, as unsealed gaskets can cause serious system
damage.
Bolt Use and Torque Application
NOTICE
Self-locking fasteners such as nylon inserts and
thread locking nuts must not be reinstalled after
removal.
1. When reinstalling locking fasteners, a new replace-
ment should always be used. Use bolts with appro-
priate length. If the bolt is too long, it may be
pressed against the adjacent part before tightening
its head to the part to be mounted; If the bolt is too
short, it will not have enough threads to bite and se-
cure the parts. The replacement bolt must have the
same or equivalent size as the original bolt.
2. In addition to the specific torque requirements given
in this manual, standard torque values should be
used on heat-treated bolts, studs, and steel nuts in
accordance with recommended factory practice
(see Page 20, Fastener Torque Specifications).
Hydraulic Pipeline and Electrical
Wiring
When unplugging or removing hydraulic lines and elec-
trical wires from the machine, the hydraulic lines and
electrical wires and their sockets should be clearly
marked, so that their reinstallation will be correct.
Hydraulic Hose and Fitting Tightening
Procedures
The hydraulic hose and fitting must be installed as per
the following requirements:
1. Before installation, check the seals on the hose and
fitting, and replace the seal or even the hose assem-
bly and fitting if the seal is found to be damaged or
oil spills out of the seal; if not, clean the hose and fit-
ting before installation.
2. If the seal is to be replaced, lubricate the replace-
ment seal before installation.
3. For installation, align the fitting, hose and hose nut,
and tighten the nut with the torque specified in Page
22, Hydraulic Hose Torque and Page 22, Hy-
draulic Fitting Torque. Once the tightening torque
of the fitting or hose exceeds the specified value, its
seal cannot be reused.
4. After installation, test all machine functions and in-
spect the hose, fitting and related components for
leaks.
Application of Insulating Silicone
Grease to Electrical Connections
Insulating silicone grease should be applied to all elec-
trical connections for the purpose of:
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