01
–1–2
7) Place the removed parts in order and attach tags
to facilitate the reassembling.
8) Note the location and quantity of parts commonly
applied to multiple locations.
(3) Inspecting parts
1) Ensure that the disassembled parts are free from
seizure, interference and uneven contact.
2) Measure and record wear condition of parts and
clearance.
3) If the problem is found in a part, repair or replace
it with a new one.
(4) Reassembling hydraulic equipment
1) Turn ON the ventilation fan or open windows to
maintain good ventilation prior to starting the
cleaning of parts.
2) Perform rough and finish cleaning before
assembling.
3) Remove washing oil by air and apply clean
hydraulic or gear oil for assembling.
4) Always replace the removed O-rings, backup
rings and oil seals with new ones by applying
grease in advance.
5) Remove dirt and moisture from and perform
degreasing on the surface where liquid gasket to
be applied.
6) Remove rust preventive agent from the new parts
before use.
7) Fit bearings, bushings and oil seals using special
jigs.
8) Assemble the parts utilizing matching marks.
9) Ensure all the parts are completely assembled
after the work.
(5) Installing hydraulic equipment
1) Ensure hydraulic oil and lubricant are properly
supplied.
2) Perform air releasing when:
a. Hydraulic oil changed
b. Parts of suction side piping replaced
c. Hydraulic pump installed
d. Slewing motor installed
e. Travel motor installed
f. Hydraulic cylinder installed
Operation of the hydraulic equipment without
filling hydraulic oil or lubricant or without
performing air releasing will result in damage to
the equipment.
3) Perform air releasing after loosening the upper
drain plug, starting the engine and keep it in low
idle condition. Complete the air releasing when
seeping of hydraulic oil is recognized, and tightly
plug.
4) Perform air releasing of the travel motor and the
hydraulic cylinders by running the engine for more
than 5 minutes at low speed without load.
Do not allow the hydraulic cylinder to bottom
on the stroke end just after the maintenance.
5) Perform air releasing of pilot line by performing a
series of digging, slewing and travel.
6) Check hydraulic oil level after placing the
attachment to the oil check position, and replenish
oil if necessary.
1.4 ELECTRICAL EQUIPMENT
(1) Do not disassemble electrical equipment.
(2) Handle it carefully not to drop and give a shock.
(3) Turn the key OFF prior to connecting and
disconnecting work.
(4) Disconnect the connector by holding it and
pressing the lock. Do not pull the wire to apply
force to the caulking portion.
(5) Connect the connector and ensure it is completely
locked.
(6) Turn the key OFF prior to touching the terminal
of starter or generator.
(7) Remove the ground (earth) terminal of battery
when handling tools around the battery or its relay.
(8) Do not splash water on the electrical equipment
and connectors during machine washing.
(9) Check for moisture adhesion inside the
waterproof connector after pulling it out, since it
is hard to remove moisture from the connector. If
moisture adhesion is found, dry it completely
before the connection.
• Battery electrolyte is hazardous.
Checking hydraulic oil level
Oil level lines (Level
located between the
two lines shows ap-
propriate amount of
oil)
Level gauge