FO-4 I&T (Remastered Ver.1.2 ) 05-24-2015
Fig. FO95 Legend
C. Pump valve chamber 9. Valve guide socket
CV. Check valve spring of item 10 10. Relief (safety) valve
GP. Guide pin (pump piston) 11. Control valve
RV. Relief valve spring of item 10 12. Gasket
2. Valve clamp 15. Pump cam
3. Plug 16. Cam block (2 used)
4. Outlet valve spring 17. Pump (yoke) piston (2 used)
5. Outlet valve 18. PTO shaft bushing
6. Inlet valve spring 19. Pump base
7. Inlet valve 22. Drain plug
8. Valve guide 23. Gasket
a rocker lever which in turn is operated by a single control lever.
Throughly wash all parts in an approved solvent being sure to remove all gum,
carbon or varnish from the surfaces. Renew any corroded, scratched or worn parts
and check and service the valves and bushings in the pump as per paragraphs 125
through 129.
125. PUMP VALVE. This pump valve (11-Fig. FO95) which takes the place of the
intake and exhaust control valves on the 8N tractors is available in only one
diameter. It should be a minimum-clearance-free-fit in the bushing (B). Bushing (B_
is available in oversizes of .010 and .020 on the outside diameter.
126. SAFETY AND CHECK VALVE UNIT. The check valve portion (CV-Fig. FO95) of this
assembly is exactly the same as the check valve used in pumps for model 8N
tractors. If inspection shows that check valve has been leaking, check for
irregularities of the seat surface in the pump base. Seat can be recut by using
special Ford reseating tool or equivalent as shown in Fig. FO96. Leakage signs on
valve can be corrected by renewal of valve followed by light lapping if necessary.
The safety valve portion of the assembly indicated by the spring (RV), ball and
cotter pin is factory adjusted to unseat at a minimum pressure of 1600 psi. if any
parts of this valve are worn or broken or show leakage, install a new valve unit.
127. INLET AND OUTLET VALVES. Inlet and outlet valves (5 and 7-Fig. FO95) are
identical to the similar parts used in the 8N tractors. Valves can be reseated by
using special Ford reseater as shown in Fig. FO97 and the valves can be refaced. Be
sure guides and sockets (8 and 9) are aligned to give concentric seating and that
they are in good mechanical condition.
128. PTO SHAFT BUSHING. Bushing (18-Fig. FO95) is identical with bushing used in
Connect/Report Errors – jcchapster@gmail.com
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