New Holland T8010 Manual page 813

Inspection
STEP 9
1. Check the two PTO modulation spool springs
with a compression tester. Check each spring for
free length and for compressed load force per
specifications in this section.
2. Inspect the valve spool and piston for heavy wear
or damage. If present, the complete assembly
must be replaced.
3. Replace all O-rings.
4. Clean the valve body with suitable cleaning fluid.
Section 35 - Hydraulic Systems, 3PT - Chapter 3
66L7
35-3-6