Cab Tilt Pump Reservoir Fluid Level and System Check

Before checking the hydraulic fluid level in the tilt pump reservoir on Argosy COEs, the cab must be in the operating position, with the cab latches locked and the valve lever in the "down" position. Let it remain in this position for at least five minutes before checking the reservoir. The reservoir is full when the fluid level reaches the threaded area of the fill plug location.

If the hydraulic fluid level is low, check all fittings and lines for leaks. If any fittings are loose, tighten them finger-tight, then tighten with a wrench until there is firm resistance; tighten one-sixth turn more. Replace any damaged or worn fittings or lines before adding fluid. Then bleed any air from the system; see of the Century Class Trucks Workshop Manual for instructions. Add MIL5606 fluid or an equivalent oil to bring the level up to the bottom of the fill tube elbow.

A "spongy" feel in the operation of the pump indicates that air is present in the hydraulic cab-tilt system. Bleed the air from the system; see of the Century Class Trucks Workshop Manual for instructions.

Check for wear of the mounting pin on both tilt cylinders when the cab is in the raised position. Check that the pins are securely fastened by inspecting the two retaining Torx® screws at the top of each assembly. Check the tilt pump mounting bolts for tightness; see of this manual for torque values for lubricated or plated fasteners.