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a When the hydraulic cylinder is used for the first time after reassembly of the hydraulic equipment such as
the hydraulic cylinder, pump, etc. and piping after removing them for repair, be sure to perform air bleeding
of the hydraulic circuit according to the following procedure.
1. Start the engine, and run it at low idle.
2. Repeat the operation to extend and retract each cylinder of the work equipment to approximately 100
mm before the stroke end 4 to 5 times.
3. Operate the hydraulic cylinder 3 to 4 times to the end of its stroke.
a After the completion of repair and when operating the machine which is stored long term, perform the air
bleeding with the same procedure as the one described above.
Precautions at the time of completing work
Refilling of coolant, oil and grease
When the coolant is drained, tighten the drain valve securely, then refill the coolant reservoir with the cool-
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ant Komatsu recommends to the specified level. Start the engine to circulate the coolant in the piping, and
add the coolant to the specified level again.
When the hydraulic components are removed and installed, refill the oil reservoir with the oil Komatsu rec-
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ommends to the specified level. Start the engine to circulate the oil in the piping, and add the oil to the
specified level again.
If the hydraulic piping or hydraulic equipment is removed, be sure to bleed air from the system after re-
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building the parts, by referring to "Testing and adjusting".
Supply the specified amount of grease to the work equipment parts.
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Testing installed condition of cylinder heads and manifolds
Check the cylinder head and intake and exhaust manifold mountings for looseness.
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If any bolt is loose, retighten it.
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a For the tightening torques, see the "Disassembly and assembly".
Testing of engine piping for damage and looseness
Intake and exhaust
system
Cooling system
Fuel system
Check of KDPF or muffler and exhaust pipe for damage and looseness
Visually check the KDPF or muffler, exhaust pipe and their mounting parts for a crack and damage. If any
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part is damaged, replace it.
Check the mounting bolts, nuts, and clamps of the KDPF or muffler, exhaust pipe and their mounting parts
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for looseness.
If any part is loosely installed, retighten the bolts.
Check of KDPF or muffler function
Check the KDPF or the muffler for unusual noise comparing to the noise when they are new.
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If any unusual noise is heard, repair KDPF or muffler, referring to "Troubleshooting" and "Disassembly and
assembly".
WA200-7
Check the piping for damage, the mounting bolts and nuts for looseness, and the joints for
air suction and exhaust gas leakage.
If any part is loosely installed or damaged, retighten the bolts or repair the parts.
Check the piping for damage, the mounting bolts and nuts for looseness, and the joints for
water leakage.
If any part is loosely installed or damaged, retighten the bolts or repair the parts.
Check the piping for damage, the mounting bolts and nuts for looseness, and the joints for
fuel leakage.
If any part is loosely installed or damaged, retighten the bolts or repair the parts.
00 Index and foreword
Precautions when performing operation
00-47
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