GPTWR-3 SERIES (2008 Release) - Maxon

PLATFORM WILL NOT RAISE, BUT MOTOR RUNS1. Do the CHECKING HYDRAULIC FLUIDprocedure in this manual. If necessary,add hydraulic fl uid.2. Check for the following. (Refer to ELECTRICAL SCHEMATIC.)• Ground connections are clean and tight at battery and pump.Clean and/or tighten if necessary.• The (+) and (-) battery cable connections are clean and tightat battery and pump. Clean and/or tighten if necessary.• Voltage drops on battery/power cables (use voltmeter)Clean and/or tighten connections or replace cables thatindicate voltage drops.3. Check for structural damage and 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 pump oil fi lter in the reservoir(FIG. 49-1). Clean or replace fi lter, ifnecessary.RELIEFVALVEADJUSTMENTCOVERRESERVOIR11921 Slauson Ave. Santa Fe Springs, CA. 90670 (800) 227-4116 FAX (888) 771-77135. Check for dirty raising relief valve (FIG.49-1). Clean or replace relief valve ifnecessary.CHECKING THE RAISINGRELIEF VALVEFIG. 49-149