New Holland CX720 Repair Manual page 1687

8. Valve Springs
Checked on a flat surface squareness, should not
exceed 1.52 mm (0.060 in), between the square,
and spring at the top edge, Fig. 6.
Length of valve springs should be checked on both
free length, and loaded length.
Free length = 60.7 mm (2.39 in)
Installed length = 47-49.6 mm (1.86-1.95 in)
Loaded length = 48.26 mm (1.9 in) using a weight of
28-31 kg (61.96 lb)
Loaded length = 1.4 in (35.69 mm) using a weight of
61-69 kg (135-153 lb)
Ensure the valve spring retainer locks are in good
condition, and replace if worn or damaged.
9. Rocker Shaft Inspection and Reassembly
Separate rocker shaft assembly by removing the
cylinder head bolts (3) and withdraw the supports
(2) springs (1) rockers (4) and spacers (6).
Clean all components using approved cleaning solu-
tion and make sure all oil passages are clear.
Inspect rocker arm adjusting screws, and push rod
ends of the rocker arm, including the ball end of the
screws for nicks, damage, or excessive wear.
Inspect the inside diameter of the rocker arm for dam-
age or wear. If any of these characteristics are not to
specification replace with new parts.
Check the ends of the push rods for damage or wear.
If not to specification or push rods were found not to
be straight during dismantling install new rods.
NOTE: Do not attempt to straighten bent push rods, re-
place with new.
10. Check the rocker shaft for signs of wear or damage
on internal and external diameters respectively.
Re-assemble the rocker shaft components onto the
shaft ensuring the shaft identification groove (1) is
positioned forwards and upwards. This ensures oil
grooves and holes face downwards.
POWER PRODUCTION - ENGINE
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