Foreword and general information
Precautions when performing work
PC800, 850-8E0
2.
Precautions for installation work
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Tighten all of the bolts and nuts (sleeve nuts) to the specified torque (KES).
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Install the hoses without twisting or interference and fix them with intermediate clamps, if available.
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Replace all of the gaskets, O-rings, cotter pins, and lock plates with new parts.
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Bend the cotter pins and lock plates securely.
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When coating with adhesive, clean and degrease the part, and coat the threaded portion with two to
three drops of adhesive.
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When coating with liquid gasket, clean and degrease the surface, and apply it uniformly after making
sure that the surface is free from dirt or damage.
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Clean all of the parts, and correct any damage, dents, burrs, or rust found on them.
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Coat the rotating parts and sliding parts with engine oil.
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When press-fitting parts, coat the surface with molybdenum disulfide lubricant (LM-P).
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After installing the snap rings, check that the snap ring is settled in the ring groove completely.
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When connecting wiring connectors, clean the connector to remove all oil, dirt, or water, then connect
them securely.
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When using eyebolts, check that there is no deformation or deterioration, screw them in fully, and align
the direction of the hook.
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When installing split flanges, fasten them uniformly and alternately to prevent excessive tightening on
one side.
a
When operating the hydraulic cylinders for the first time after reassembling the cylinders, hydraulic
pumps and other hydraulic component removed for repair, be sure to bleed the air as follows:
1] Start and run the engine at low idle.
2] Operate the work equipment control lever to operate the hydraulic cylinder four to five times, stop-
ping the piston at 100 mm off the end of its stroke.
3] Next, operate the hydraulic cylinder three to four times to the end of its stroke.
a
When using the machine for the first time after repair or long storage, follow the same procedure.
3.
Precautions for completing work
1) Refilling of coolant, oil and grease
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If the coolant is drained, close the drain valve, and add coolant to the specified level. Run the engine
to circulate the coolant through the system . Then add the coolant again if necessary.
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If the hydraulic component is removed and installed again, add engine oil to the specified level. Run
the engine to circulate the oil through the system. Then add the oil again if necessary.
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If the hydraulic piping or hydraulic equipment are removed, be sure to bleed air from the system
after reassembling the parts, by referring to "Testing and adjusting".
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Supply the specified amount of grease (molybdenum disulfide grease) to the work equipment parts.
2) Check of installed condition of cylinder head and manifolds
Check the cylinder head and intake and exhaust manifold mountings for looseness.
If any part is loosened, retighten it.
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For the tightening torques, see the "Disassembly and assembly".
3) Checking engine piping for damage and looseness
Intake and exhaust system
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 loosened or damaged, retighten or repair it.
Cooling system
Check the piping for damage, the mounting bolts and nuts for looseness, and the joints for coolant leak-
age.
If any part is loosened or damaged, retighten or repair it.
Fuel system
Check the piping for damage, the mounting bolts and nuts for looseness, and the joints for fuel leakage.
If any part is loosened or damaged, retighten or repair it.
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