NPK M20C, Instruction Manual, Page: 98 / 152

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98
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CYLINDER INSPECTION AND MAINTENANCE
ASSEMBLY
7. Install cylinder rod nut (c1) onto cylinder rod (c3) and torque to the listed value
below.
MODEL THREAD TORQUE SOCKET ROD NUT PART NUMBER
SIZE ft. lb. (
Nm
) SIZE STYLE "A" STYLE "B" STYLE "C"
M20 M65 x 3.0 3,250 ( 4,400 ) 90 mm 16032575 16084717 X
M28
M70 x 3.0 4,100 (
5,500 )
120 mm 16039992 16084683 G180-1000
M38
M70 x 3.0 4,100 ( 5,500 ) 120 mm 16039992 16084683 G180-1000
8. Install the set screw. If the original factory lock nuts are to be re-used, a dimple
must be drilled into the piston rod (Style “A” type) or the piston (Style “B” type) using
the existing threaded hole as a guide. The maximum depth of the hole should not
exceed 1/64
th
inch (0.5 mm) . Apply a small amount of medium strength thread
adhesive to the set screw before installing. If the lock nut is replaced (Style “C”
type), the replacement will have a nylon patch and will not require a set screw.
9. Using a ring expander (t16), install the piston rings with the splits in the piston rings
opposing each other.