Hein-Werner Series 14 Hydraulic Backhoes Service & Parts Manual – PDF DOWNLOAD
DESCRIPTION:
Hein-Werner Series 14 Hydraulic Backhoes Service & Parts Manual – PDF DOWNLOAD
HYDRAULIC CIRCUITS AND CONTROLS
- The information in this section is designed to furnish the owner and operator of the Hein-Werner C-14 Backhoe with the basic information needed to understand the operation of the machine.
- An understanding of the various systems is essential to proper operation and service, and we suggest this description be read thoroughly. Power is supplied by a diesel engine, the make of which is optional.
- (For parts and service information, refer to the engine manual furnished with your machine.) The engine output shaft is coupled to a clutch and gear box which drives three separate gear type pumps. The lower right pump (looking at the pump side of the gear case) delivers high pressure oil to the three-spool , control valve for the boom and bucket cylinders and one propel motor on crawler mounted machines and to the boom and bucket cylinders and one outrigger cylinder on carrier mounted machines.
- The lower left pump delivers high pressure oil to the two-spool control valve for the dipstick cylinder and the other propel motor on crawler mounted machines and to the dipstick cylinder and the other outrigger cylinder on carrier mounted machines.
- The upper pump delivers high pressure oil to the single spool control valve and, if the machine is equipped with a power-speed boost circuit, to a solenoid valve. The solenoid valve connects the output of the swing pump into the boom and dipstick circuits to provide higher speeds for lifting the boom and higher speeds and greater power for tucking the dipstick.
- When the swing and dipstick control valves are in neutral position, oil flows through the valve and return lines to filters on the hydraulic reservoir. Return oil from the swing motor, the propel motor (or outrigger cylinder) and dipstick cylinder also passes through the valves and return lines.
- When the boom and bucket control valve is in neutral, the oil flows through the valve, return line, heat exchanger, and then through a filter to the reservoir. Return oil from the boom and bucket cylinders and the propel motor or, outrigger cylinder also passes through the valve and heat exchanger.
- The heat exchanger uses air drawn through the radiator by the engine to cool the oil. The filter in each hydraulic circuit contains a removable element that can be cleaned or replaced. The filters include a pressure gage which is visible from the cab and indicates the condition of the filter element.
- When the gage pointer is in the red zone, the element must be cleaned or replaced. The three control valves are operated by levers and pedals in the operator’s cab (Figure 2). The solenoid valve is operated by buttons on the levers.
- The cab is also equipped with a complete set of engine gages and controls. The engine gage set consists of an ammeter, individual gages for fuel level, oil pressure and water temperature, and a combination tachometer and engine revolution hour meter.
- When a typical cylinder circuit is put into operation by moving the control lever or pedal in either direction from the neutral position, the valve spool moves within the control valve. This spool reroutes the oil flow from the return line port to the port which supplies oil to the cylinder being used. This spool is spring-loaded to return to neutral position when the control lever or pedal is released.
- The control valves have excellent “feathering” characteristics to assure smooth and precise operation of all components. The control valves contain a relief valve which is adjusted at the factory to a specified limit.
- If the pressure demanded by the circuit being used exceeds this pre-set limit, the relief valve will bypass the oil to the reservoir until the pressure demanded by the circuit drops to the specified pressure setting.
- The swing control valve is identical in design to the other two control valves except that it is an “open center” type valve. This design allows the machine to “coast” when the valve is in neutral and reduces shock loads on the swing system components caused by jarring stops.
- Three in-line relief valves protect the boom, dipstick and swing circuits from excessive pressures caused by external forces. 1
TABLE OF CONTENTS:
Hein-Werner Series 14 Hydraulic Backhoes Service & Parts Manual – PDF DOWNLOAD
SECTION I — BACKHOE DESCRIPTION
Hydraulic Circuits and Controls . .
Swing System …..
Digging Members
SECTION II — BACKHOE OPERATION
Preparation for Use 3
Starting the Engine 3
Operating Controls 3
Boom Position Adjustment 4
Digging Hints 4
Stopping the Engine 4
Preparation for Storage 4
SECTION III — BACKHOE MAINTENANCE AND REPAIR . 5
Maintenance 5
Lubricants 5
Maintenance Schedules 5
Hydraulic Circuit Pressure Checks 7
Swing Brake Adjustment 8
Tool Kit 8
Swing Gear Box Repair 8
Shaft Bearing Adjustment 9
Hydraulic Cylinder Repair 10
SECTION IV — REPAIR PARTS LIST
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- This is the same manual used by the dealers to diagnose and troubleshoot your vehicle
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