Bulletin HY25-1135-M1/US
Owner’s Manual
Parker Hannifin Corporation
Chelsea Products Division
Olive Branch, MS 38654 USA
9
General Installation
6 and 8-Bolt PTOs
Mounting the PTO (Continued)
8. Torque fasteners to their proper specifications (Fig. 10).
Self-Locking Nuts:
• (3/8" - 24) for 6-Bolt applications
35-40 lbs-ft [47-54 Nm]
• (7/16" - 20) for 8-Bolt applications
55-60 lbs-ft [75-81 Nm]
Capscrews:
• (3/8") for 6-Bolt to 30-35 lbs-ft [40-47 Nm]
• (7/16") for 8-Bolt to 45-50 lbs-ft [60-61 Nm]
Checking Backlash
WARNING: PTOs for the EATON ENDURANT™ transmission
(including PACCAR models) which include the 489, 680, 880
Series (Fig. 11) have UNIQUE main housings, gears, piloting
studs, as well as, a special molded PTO-to-transmission
mounting seal. See Supplemental Installation Instructions
(P/N 69-P-27) included in the Installation Kit (328948-48X) for
proper installation. These special PTOs do NOT require the
addition of extra gaskets/shims for backlash adjustment!
If there are any questions during the installation, stop and call
your local Chelsea Distributor for assistance.
To check for proper backlash on PTOs with shift cover.
1. Remove the PTO shift housing and/or inspection plate.
2. Mount the dial indicator so that it registers movement of
the input gear (driven gear) of the PTO (Fig. 12).
NOTE: For proper location of dial indicator contact point
(See Fig. 13). (Two common type dial indicators shown).
3. Hold the PTO driver gear in transmission with a
screwdriver or bar and rock the PTO input gear (driven
gear) back and forth with your hand. Note the total
movement on the dial indicator.
4. Establish backlash at .006"-.012" [.15mm-.30mm] by
adding or subtracting gaskets.
General rule: A Chelsea .010" gasket will change
backlash approx. .006". A .020"gasket changes
backlash approx. .012".
5. Replace the shift housing and/or inspection plate and
retorque (4) four capscrews to 24-28 lbs-ft [33-39 Nm].
Fig. 12
Fig. 13
Fig. 10
Fig. 11
O-Ring
489 Series
680 Series
660
Series
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