Scribe alignment marks on check valve body (6)
Remove the four cap screws ( 19 & 25) so that
check valve body (6) can be separated from
Remove O-ring (7) and valve seal (8) from body
CLEANING AND INSPECTION
Wash all metal parts in cleaning solvent, then dry.
Discard all rubber parts which are supplied with service
Examine covers, check valve body, piston and body.
All contacting surfaces for O-rings must be smooth,
round and free of deep scratches, dents or gouges.
Valve seat at end of piston and in the check valve body
must be smooth showing no dents or distortion. The
sealing surfaces in the cover must be smooth and free of
dents and gouges. Snap ring groove in valve body must
not be distorted and must be free of corrosion.
Replace parts that show any of the above defects.
Lubricate all seals and sliding surfaces using Item 1
in LUBRICANT SPECIFICATIONS. Refer to Fig. 4 for
numbers in parenthesis.
Position valve (8) in body (17) so that the valve
lays flat on flutes of body.
Position O-ring (7) in groove of the flange of
Position check valve body (6) on body (17)
aligning scribed alignment marks. Install cap
screws (19 & 25). Tighten cap screws to 13.56-
15.82 Nm (120-140 in. lbs.).
Position O-rings (5) in grooves in both covers (2
Position check valve discs (3) on valve seats in
the check valve body.
Position hand control cover (2) on check valve
body adjacent to foot valve no. 1 port, then install
foot valve no. 2 cover (4). Tighten screws to 1.-
1.808 Nm (12-16 in. lbs torque.
7. Position O-ring (9) in valve body and O-ring on
piston (10). Insert piston assembly with tapered
end toward check valve body.
8. Position spring (12) in piston and place exhaust
disc (13) on spring. Align and push exhaust disc
firmly into valve body. While holding spring in
valve body, install snap ring (16), making sure it
seats properly in valve body.
9. Position valve disc (21), O-ring (20) and plug
(22) in bleed back opening (D). Then install star
When reinstalling manifolded tractor protection valve
on vehicle, be sure to perform the service checks before
releasing the vehicle for service.
CTS-4079 - CHAPTER XI - Page 10