GPTWR-3 SERIES (2008 Release) - Maxon

PLATFORM RAISES PARTIALLY AND STOPS1. Lower the opened platform to the ground. Do theCHECKING HYDRAULIC FLUID procedure inthis manual. If necessary, add hydraulic fl uid.2. Use voltmeter to verify the battery voltage is 10.5volts or more under load from pump motor.11921 Slauson Ave. Santa Fe Springs, CA. 90670 (800) 227-4116 FAX (888) 771-77133. Check for structural damage and poor lubrication.Replace worn parts.CAUTIONKeep dirt, water and other contaminants fromentering the hydraulic system. Before openingthe hydraulic fluid reservoir filler cap, drainplug and hydraulic lines, clean up contaminantsthat can get in the openings. Also, protectthe openings from accidental contaminationduring maintenance.NOTE: In most cases, you can avoid havingto manually bleed hydraulic system bycorrectly positioning Liftgate platformbefore disconnecting any lifting cylinderhigh pressure hydraulic lines.4. Check for dirty raising relief valve (FIG.52-1). Clean or replace relief valve, ifnecessary.5. Check the hydraulic cylinder. With the platformat vehicle fl oor level, remove the hydraulicline from the LOWER port on the cylinder(FIG. 52-2). 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.RELIEFVALVEADJUSTMENTCOVERLOWER PORTFIG. 52-1RAISE PORTRESERVOIR6. Check pump oil fi lter in the reservoir(FIG. 52-1). Clean or replace fi lter, ifnecessary.FIG. 52-252