Bulletin HY25-1890-M1/US
Owner’s Manual
10-Bolt Extended Shaft PTOs
Parker Hannifin Corporation
Chelsea Products Division
Olive Branch, MS 38654  USA
12
Installation Instructions
14.  The tube assembly is lined up and inserted 
  into the Input Housing. As this is done, the 
  bolts for the bracket should be started into the 
  rear of the transmission (Fig. 14).
15.  As soon as at least 1 bolt is started, the tube 
  assembly cannot fall. The unit can be aligned 
  and slipped together with the transmission 
  taking the weight (Fig. 15).
NOTE: When attaching the tube to the input housing use 
4 NEW cap screws supplied with the PTO.
16.  Install the 4 Hex Head Cap Screws (378431-13, 
  3/8"-16 x 1.375") and flat washers 380076-07 
  to make the final attachment between the input  
  housing and the tube assembly. Torque the Cap 
  Screws to 30-35 lbs-ft [41-47 Nm] (Fig. 16). 
17.  The 3 longer bolts in the transmission should be  
  torqued as follows:
  3000 Family - 66-81 lbs-ft [90-110 Nm]
  4000 Family - 74-89 lbs-ft [100-120 Nm] 
 (Fig. 17).
18.  To complete installation of the PTO, see SK 
  drawings on pages 17-19 for wiring and plumbing  
 installation.
19.  See SK-493 page 16 for installation of XV, AB, 
  or AC Outputs. 
20.  When installing pumps use O-Ring supplied with 
  PTO between pump and PTO output. Torque 
  pump bolts to proper torque specifications. Refer 
  to page 4 of this manual for proper pump bracket
  support requirements.
NOTE: Do not use a gasket with O-Ring.
As with all auxiliary power systems, there are 
different concerns and needs with varying applications, 
duty cycles, and driven equipment. Chelsea endeavors 
to provide options that will ensure trouble free use of our 
products and system solutions.
For customers that would like an extra level of protection 
from pump seal leaks, there are double sealed pumps 
available from Parker to satisfy your needs. Please verify 
your requirements with your Parker/Chelsea PTO and 
Pump experts.
Fig. 16
Fig. 14
Fig. 17
Fig. 15
PTO Installation (Continued)
   WARNING: Do not run PTO w/ wet spline output option if pump is not installed and connected to hydraulic 
system. Failure to do so may damage PTO and/or Transmission. See page 15 for output cover plate options.