E-72 power unit service manual - Meyer Products

1 FORM NO. 1-1047 January 2012E-72power unitservice manual 2012 Printed in the Products LLC18513 Euclid Ave. Cleveland, Ohio 44112-1084 Phone 486-1313 (Area Code 216) email service manual includes complete information for servicing the following Electro Lift Units:E-72 IMPORTANT: Maintenance and repairs must be performed with the moldboard on information is grouped according to the type of work being performed, such as diagnosis andtesting, disassembly and reassembly. Special tools and specifications are also included in this information, illustrations and product descriptions contained in this manual are correct at publicationtime. We do, however, reserve the right to make changes at any time without prior Products INDEXS ection NumberSection INFORMATION DESCRIPTION ANDTHEORY OF OPERATION.

2 Products Inc. reserves the right, under its continuing product improvement program, to change construction ordesign details, specifications and prices without notice or without incurring any 0 - GENERAL INFORMATION AND MAINTENANCECONTENTSGENERAL MODEL MODEL IDENTIFICATION ANDSERIAL NUMBER MOTOR GENERAL VEHICLE ELECTRICAL CHECK Meyer HYDRAULIC FLUID M-1 ..2 REPLACEMENT OF HYDRAULIC PROTECTION AGAINST RUSTAND Electrical SystemMaximum performance and efficiency of the ElectroLift unit requires that the vehicle s electrical systembe properly maintained and consist of:Battery-----------70 Amp. Hr. Minimum or550 Cold Cranking Amp. MinimumCheck Regularly1. Battery Terminals - Must be clean and free Electrical Connections - Must be free of corrosionand Battery - Must be in first-class Alternator (or Generator) and Regulator - Must befunctioning to Hydraulic Fluid Reservoir Level - A significant dropin hydraulic fluid level indicates a leak which mustbe located and corrected.

3 Insufficient hydraulic fluidmay result in severe MAINTENANCEM eyer Hydraulic Fluid Hydraulic Fluid M-1 is a specially formulatedmineral oil which maintains an almost constantviscosity from normal to sub-zero it remains free flowing at extremely lowtemperatures, the performance and efficiency are Hydraulic Fluid M-1 also contains an additivewhich neutralizes moisture accumulating in the fluiddue to condensation. It is effective for a maximum ofone year s Products Inc. will not be liable for damagesresulting from the use of inferior or other fluids INFORMATIONM odel IdentificationThe E-72 unit is an electrically powered hydraulicmechanism specifically designed for use with the MeyerE-Z Mount Plus and Drive Pro Snow Plow Identification and Serial Number LocationInclusion of the model number and serial number isextremely important when writing up warranty claimforms and product report forms for proper evaluationand follow basic model number is located on the nameplate (plastic cover).

4 The serial number is locatedon the name plate decal underneath the plastic following maintenance information is intended asa basic guide for providing the E-72 unit with the properservice and care. Sustained heavy duty operation oroperating under adverse conditions may necessitatemore frequent MaintenanceCleanlinessThe greatest enemy to any hydraulic system is dirt orcontamination. Therefore, cleanliness must be stressedat the time of installation, servicing and of Hydraulic FluidAfter a season s use, completely drain the hydraulicfluid (including hydraulic fluid in hoses andcylinders). Drain fluid through drain plug shown inFigure 0-1. Disconnect the fittings at the Angling andLift cylinders and completely retract the cylinder rodsand purge cylinders and hoses of all hydraulic the complete system including unit, hoses andangling rams with the M-2 Flushing Fluid, or a nonwax (Napthenic) cleaner.

5 If kerosene (Parrafinic) is usedto flush the system, the system must be flushed againto remove any kerosene with M-2 Flushing Fluid, or a(Napthenic) based cleaner that is wax E-72 unit with M-1 Fluid by fully retracting lift rod(Ram) and filling reservoir to the fill mark on the sideof the reservoir. Fill and bleed hoses and power Anglingcylinders by loosening hydraulic fittings at cylindersuntil they leak. power angle plow repeatedly from oneside to the other until fluid flows steadily from theleaking fittings while maintaining a constant check onthe reservoir fluid and lower the plow several times and with liftrod fully retracted, give a final check to the fluidlevel and replace filler Against Rust and CorrosionWhen the E-72 unit is not used for extended periods,protect the chromed lift rod (Ram) by fully extendingit and coating it with chassis lubricant.

6 Full extensionof the lift rod (Ram) fills the cylinder with hydraulicfluid. Coat the exposed portions of the power Anglingcylinder rods (Rams) with chassis lubricant to protectthem against rust and 0-1-3-Filler PlugDrain PlugSECTION 1 - GENERAL DESCRIPTION AND THEORY OF OPERATIONCONTENTSGENERAL OF ELECTRICAL AND FLOW LIFT UNIT HYDRAULIC PRESSURE relief SOLENOID A Solenoid B Solenoid C Solenoid CHECK PILOT CHECK CROSSOVER relief SOLENOID DESCRIPTIONE-72 unit is an electrically powered and electricallycontrolled hydraulic mechanism specifically designedfor use with Meyer Snow Plows. The E-72 raises andlowers the plow with a remote 8" stroke hydraulic addition to raising and lowering the plowhydraulically, the E-72 angles the plow hydraulically,left and right, via remote hydraulic Electro Lift unit consists of a specially designedhigh torque 12-volt DC motor which is directly coupledto a gear-type hydraulic pump.

7 The pump obtains itssupply of hydraulic fluid from an integral reservoir whichtotally surrounds the integral hydraulic cylinder whichraises and lowers the E-72 includes an integral valve body which containsthree electrically controlled solenoid valve valve cartridge A which is energized to allowthe plow to lower by gravity. Solenoid valve cartridge B is energized to route the pressurized hydraulic fluidto the remote hydraulic lift cylinder to raise the valve cartridge C is energized to route thepressurized hydraulic fluid to the left remote hydrauliccylinder to angle the plow to the right. When allcartridge are not energized and the motor is runningthe pressurized hydraulic fluid will flow to the rightremote hydraulic cylinder to angle the plow to the components which control and supplyelectrical current to the E-72 units are an operatorcontrolled Pistol Grip controller; a solenoid switch tosupply high amperage current to the unit s motor(motor solenoid); valve cartridge(s).

8 And short heavygauge cables to distribute high amperage currentdirectly from the positive terminal of the vehicle sbattery and ground the unit directly to the negativeterminal of the vehicle s OF OPERATIONFUNCTIONSR efer to Figures 1-1 through 1-4 (pages 6 thru 9) forelectrical and hydraulic flow chart for each figure explains which component is actuated andrelated in each E-72 four basic functions performed are: Raise snow plow Lower snow plow Angle snow plow to right Angle snow plow to left-5-E-72 Raise, Motor and B Solenoid-6-FIGURE 1-1 STRAINER LIFTCYLINDERRETURN TO RESERVOIRAB LOWER ADJUSTMENTDUAL PILOT CHECKRAISECROSS-OVER relief VALVE3800 + 400 ANGLING CYLINDERSPOWER ANGLING CYLINDERS PUMPCHECK VALVEPUMPPRESSURE relief VALVE ADJUSTABLEOPENS at 2000 + 50 ENERGIZED NOTENERGIZED NOT ENERGIZEDCR eservoirE-72 Lower.

9 A Solenoid-7-FIGURE 1-2 STRAINER LIFTCYLINDERRETURN TO RESERVOIRAB LOWER ADJUSTMENTDUAL PILOT CHECKLOWERCROSS-OVER RELI EF VALVE3800 + 400 ANGLING CYLINDERSPOWER ANGLING CYLINDERS PUMPCHECK VALVEPUMPPRESSURE relief VALVE ADJUSTABLE OPENS at 2000 + 50 NOT ENERGIZED NOTENERGIZED ENERGIZEDCR eservoirE-72 Angle Left, Motor only-8-FIGURE 1-3 STRAINER LIFTCYLINDERRETURN TO RESERVOIRAB LOWER ADJUSTMENTDUAL PILOT CHECKANGLE LEFTCROSS-OVER relief VALVE3800 + 400 ANGLING CYLINDERSPOWER ANGLING CYLINDERS PUMPCHECK VALVEPUMPPRESSURE relief VALVE ADJUSTABLE OPENS at 2000 + 50 NOT ENERGIZED NOT ENERGIZED NOT ENERGIZEDCR eservoirE-72 Angle Right, Motor and C Solenoid-9-FIGURE 1-4 STRAINER LIFTCYLINDERRETURN TO RESERVOIRAB LOWER ADJUSTMENTDUAL PILOT CHECKANGLE RIGHTCROSS-OVER relief VALVE3800 + 400 ANGLING CYLINDERSPOWER ANGLING CYLINDERS PUMPCHECK VALVEPUMPPRESSURE relief VALVE NON ADJUSTABLE OPENS at 2000 + 50 NOT ENERGIZED ENERGIZED NOT ENERGIZEDCR eservoirUnder a condition, such as when a hydrauliccylinder is extended to the end of its stroke,eliminating additional space for the pressurizedhydraulic oil to be pumped into, the alternateopening and closing of the poppet valve controlsthe pump s pressure output and provides an escapefor the pressurized hydraulic pressure relief valve used in the E-72 hydraulicunit.

10 While more sophisticated than the one described,functions in the same manner. The pump pressure reliefvalve may be adjusted to the specified pressure of2000 by adjusting the set screw after installing asuitable pressure gauge of 2500 in the VALVESH ydraulic valves are simple in concept and all havethe same basic function: control the direction of Solenoid Valve consists of two components:the Cartridge and the Cartridge consists of the hydraulic valvemechanism and an armature which enables thevalve mechanism to be operated and controlledelectrically. The Cartridge is designed to screw inand out of the E-72 units much like the typical spark plug .CoilFIGURE 1-7 COILVALVE SPOOLWINDINGARMATUREFIGURE 1-5 ELECTRO LIFT UNIT COMPONENTSRESERVOIRELECTRICMOTORFLOWOUTL ET LINEINTAKE LINEPUMP CHAMBERPUMP HOUSINGDRIVE GEARDRIVEN GEARFLOWOUTLET PORTPOPPET VALVEVALVE SPRINGPUMP HOUSINGINLET PORTFIGURE 1-6-10-PRESSURE relief VALVEA basic pressure relief valve is shown inFigure 1-6.