f. Installation. Reverse the procedure in a. above.
(1) Remove large hex head plug, valve piston
HYDRAULIC LINES AND FITTINGS.
Maintenance of the hydraulic lines and fittings is limited
to removal of defective parts and replacement with new
(2) Remove smaller hex head, shims, spring and
hydraulic lines and fittings. Visually inspect hydraulic
valve. Note arrangement of parts for ease of assembly.
lines and fittings during operation for signs of hydraulic
fluid leakage or restrictions signified by operational
c. Cleaning, inspection, and repair. Clean all parts
Tag hydraulic lines as they are
in SD. Inspect piston and bore of valve body for wear or
disconnected to facilitate installation and cap hoses or
burs. Inspect valve for damage that might cause
plug parts, as required, to exclude dirt or other
leakage. Repair slightly dam aged threads with a tap.
6-34. TILT CYLINDERS.
(1) Install valve in spring, shims and smaller plug
in top part of body.
(1) Remove truck floor plate.
(2) Install spring, piston and largest plug in
horizontal part of body.
(2) Tag and disconnect hoses (figure 6-17) from
tilt cylinders. Cap hoses and plug ports in cylinders to
e. Test after assembly. With lift and steering ports
temporarily plugged, apply increasing hydraulic pressure
to the inlet port. The relief valve should crack open at
(3) Support mast so it will not suddenly tilt on
650 to 750 psi, and be held fully open at 1000 to 1100
removal of tilt cylinders.
psi. Adjust setting, if necessary, by adding or removing
Figure 6-17. Tilt Cylinder Removal