GPTWR-3 SERIES (2008 Release) - Maxon

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PLATFORM RAISES BUT LEAKS DOWN11921 Slauson Ave. Santa Fe Springs, CA. 90670 (800) 227-4116 FAX (888) 771-77131. Check if the “A” (lowering) solenoidvalve is constantly energized.Connect voltmeter negative (-)lead to ground (-) wires connectionon pump and positive (+) leadto (+) terminal on the “A” (lowering)solenoid valve (FIG. 52-1). Ifvoltmeter reads battery voltage,check for faulty wiring or toggleswitch.CAUTIONMOTORKeep dirt, water and other contaminantsfrom entering the hydraulic system. Beforeopening the hydraulic fluid reservoir fillercap, drain plug and hydraulic lines, clean upcontaminants that can get in the openings.Also, protect the openings from accidentalcontamination during maintenance.NOTE: In most cases, you can avoid havingto manually bleed hydraulic systemby correctly positioning Liftgate platformbefore disconnecting any liftingcylinder high pressure hydraulic lines.2. Make sure platform is on the ground. Removelowering solenoid valve (FIG. 52-2). Push onthe plunger in the valve by inserting smallscrewdriver in the open end (FIG. 52-3). If theplunger does not move with a smooth, springloadedaction (approximately 1/8”), replace thevalve cartridge. Reinstall lowering solenoidvalve. Torque valve cartridge to 30 lbs.-ft.and hex nut to 30 lbs.-in.GROUND (-)WIRE CONNECTIONTERMINAL “D”SWITCHEDBATTERY (+)FIG. 50-1“A”(LOWERING)SOLENOIDVALVEVALVE CARTRIDGEBLACK WIRE(+) CONNECTIONVALVECARTRIDGECOILNUTREMOVING SOLENOID VALVEFIG. 50-21/8”CHECKING SOLENOID VALVEFIG. 50-350
3. Check the hydraulic cylinder. With the platformat vehicle fl oor level, remove the hydraulicline from the LOWER port on the cylinder(FIG. 51-1). Hold the control switchin the UP position for two seconds while youwatch for hydraulic fl uid at the LOWER port.A few drops of hydraulic fl uid escaping theport is normal. However, if fl uid streams out,piston seals are worn. Replace seals.LOWER PORTRAISE PORTFIG. 51-111921 Slauson Ave. Santa Fe Springs, CA. 90670 (800) 227-4116 FAX (888) 771-771351
Page 1: M-08-09AUGUST 2008MAINTENANCE MANUA
Page 4 and 5: TABLE OF CONTENTSWARNINGS .........
Page 6 and 7: Comply with the following WARNINGS
Page 8 and 9: 11921 Slauson Ave. Santa Fe Springs
Page 10 and 11: PERIODIC MAINTENANCEPERIODIC MAINTE
Page 12 and 13: PERIODIC MAINTENANCECHECKING HYDRAU
Page 14 and 15: PERIODIC MAINTENANCECHANGING HYDRAU
Page 16 and 17: PERIODIC MAINTENANCEREPLACING PLATF
Page 18 and 19: PLATFORM ADJUSTMENT - Continued1192
Page 20 and 21: EXTENSION PLATE ASSEMBLY11921 Slaus
Page 22 and 23: MAIN FRAME ASSEMBLY3(2 PLACES) 5(10
Page 24 and 25: MAIN FRAME ASSEMBLY - Continued1192
Page 26 and 27: PLATFORM & FLIPOVER ASSEMBLY (ALUMI
Page 28 and 29: PLATFORM ASSEMBLY (ALUMINUM)6(2 PLA
Page 30: FLIPOVER WITH SINGLE CART STOP (ALU
Page 33 and 34: ITEM QTY. PART NO. DESCRIPTIONREF 1
Page 35 and 36: PUMP ASSEMBLY11(2 PLACES)12(2 PLACE
Page 37 and 38: CAUTIONTo prevent hydraulic lock fr
Page 39 and 40: ITEM QTY. PART NO. DESCRIPTIONREF 1
Page 41 and 42: CONTROL SWITCH AND POWER CABLENOTE:
Page 43 and 44: DECAL SHEETP/N 268454-01FIG. 43-111
Page 45 and 46: SYSTEM DIAGRAMSPUMP & MOTOR SOLENOI
Page 47 and 48: ELECTRICAL SCHEMATIC (POWER DOWN)BL
Page 49: PLATFORM WILL NOT RAISE, BUT MOTOR
Page 53 and 54: LIFTGATE WILL NOT LIFT RATED CAPACI
Page 55 and 56: 4. Verify the pump motor is grounde
Page 57 and 58: CAUTIONKeep dirt, water and other c
Page 59 and 60: CAUTIONKeep dirt, water and other c
Page 61 and 62: PLATFORM WILL NOT TILT DOWN TO THE

GPTWR-3 SERIES (2008 Release) - Maxon

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