ClARK
GROUP KNOW YOUR TRUCK TRUCK COMPONENTS AND FEATURES Main Hydraulic System/Power Steering System The parts of the main hydraulic system are the hydraulic sump tank, main hydraulic pump, flow control (priority) valve, main control valve, hydraulic oil filter, and associated hydraulic lines and hoses. The hydraulic sump is integral in the frame located on the right hand side of the truck. It has a large opening at the top with a removable cover which includes the fill tube/breather, oil level dipstick, and oil filter return line. The cover is held on with a V-clamp for positive sealing and ease of servicing. The sump breather is a standard Clark part having a nominal 10 micron at 98.5% efficiency rating.
85M436
Oil from the sump tank is pumped to the flow control valve which in turn supplies oil to the steering control valve and to the main valve. From the main valve, the oil is directed to either the lift cylinder or to the tilt cylinders (or also to attachments if the truck is so equipped) . Oil is returned to the sump tank through the spin-on, full flow return-line filter. The main hydraulic pump is mounted on the engine front cover gear driven from the engine power train. The main hydraulic valve is mounted on the front of the vehicle main frame. It has an adjustable relief valve. A separate counterbalance valve in tilt circuit has pressure compensated flow control to control tilt speeds. When attachments are used, single or double 11 aux 11 sections may be added to the side of the standard main valve.
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85M438
The actuation levers for the main valve are located on the right side of the operator mounted on the cowl and mechanically linked to the main valve. The 11L IFT 11 and 11 LOWER 11 lever is nearest the steer wheel and the "TILT" lever is the outermost lever. The system relief pressure level is tuned to match the rated capacity of the truck.
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Code: OH-539, NOV 85
