GPTWR-3 SERIES (2008 Release) - Maxon

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