Precautions For Service Work - Komatsu 4D98 Series Shop Manual

I; General
1.7
(1)
(2)
(3)
Precautions for Service Work
Precautions for Safety
Read the safety precautions given at the beginning of this manual carefully and always mind
safety in work.
Preparation for Service Work
Preparation is necessary for accurate, efficient service work. Check the customer ledger file
for the history of the engine.
P-1)
(2.2)
(2.3)
(2.4)
(2.5)
Preceding service date
Period/operation hours after preceding service
Problems and actions in preceding service
Replacement parts expected to be required for service
Recording form/check sheet required for service
Preparation before Disassembly
(3.1) Prepare general tools, special service tools, measuring instruments, oil, grease, non-
reusable parts, and parts expected to be required for replacement.
(3.2) When disassembling complicated portions, put matchmarks and other marks at places
not adversely affecting the function for easy reassembly.
(4) Precautions in Disassembly
(4.1)
(4.2)
(4.3)
(4.4)
Each time a parts is removed, check the part installed state, deformation, damage,
roughening, surface defect, etc.
Arrange the removed parts orderly with clear distinction between those to be replaced
and those to be used again.
Parts to be used again shall be washed and cleaned sufficiently .
Select especially clean locations and use clean tools for disassembly of hydraulic units
such as the fuel injection pump.
(5) Precautions for Inspection and Measurement
(5.1)
Inspect and measure parts to be used again as reuqired to determine whether they are
reusable or not.
(6) Precautions for Reassembly
(6.1) Reassemble correct parts in correct order according to the specified standards (tighten-
ing torques, and adjustment standards). Apply oil to important bolts and nuts before tight-
ening when specified.
(6.2) Always use genuine parts for replacement.
(6.3) Always use new oil seals, O-rings, packings and cotter pins.
(6.4) Apply sealant to packings depending on the place where they are used. Apply oil or
grease to sliding contact portions, and apply grease to oil seal lips.
(7) Precautions for Adjustment and Check
(7.1) Use measuring instruments for adjustment to the specified service standards.
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