Walker H37i Operator's Manual

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61Maintenance Instructions CHECKING/SERVICINGCleaning the TerminalsIf battery terminals are corroded, remove batteryfrom the mower. Using a wire brush, remove corrosion with a solution of one part baking soda andfour parts water. Rinse with clean water. Coat theterminals with petroleum jelly or terminal protectorspray to retard further corrosion.Charging the BatteryDANGERBATTERIES PRODUCE EXPLOSIVE GASES● Charge the battery in a well-ventilatedarea, so that gases produced whilecharging can dissipate.● Keep sparks, flames, and smoking ma-terials away from the battery at alltimes.● Make sure the battery cap vents areopen (check manifold vent on eachcap).● Make sure the battery charger is un-plugged before connecting or discon-necting cables to the battery.Check the battery charge by measuring the specificgravity of electrolyte; if specific gravity is less than1.225, the battery will need to be charged as follows:IMPORTANT: Always disconnect the negative ()battery terminal before charging. Failure to do socan result in damage to the ECU.1. Charge the battery at 15 amps for 10 minutes.DO NOT exceed 20 amps maximum recommended charging rate. Charge until specificgravity is at least 1.250. Total charging timeshould not exceed one (1) hour.2. After charging the battery, use distilled water toadjust the electrolyte level to the bottom of thevent wells [1/4 to 1/2 in. (6 to 13 mm) above theplates].Tire PressureInflate tires to pressures shown below:Deck Caster Wheel = 20 PSI (137 kPa)Drive = 15 PSI (103 kPa)Tailwheel = 20 PSI (137 kPa)Wheel Nut TorqueCheck the eight (8) nuts that mount the drive tires.Every 100 hours they should be torqued to 75 to 85lb·ft (102 to 115 N·m).Sharpen Mower BladesCheck mower blade(s) for straightness, sharp-ness, condition of the cutting edge, and balanceevery 10 hours of operation (or more often whenmowing abrasive type grass or operating on sandysoils). Replace blades if worn, bent, cracked, orotherwise damaged (refer to REPLACING/RE-PAIRING the Mower Blades in this section). Usethe following procedure to check and sharpenblades:NOTE: Keep blades sharp—cutting with dullblades not only yields a poor mowing job but slowsthe cutting speed of the mower and causes extrawear on the engine and blade drive by pulling hard.1. Stop the engine, remove ignition key, and disconnect the spark plug wires before raising themower deck to service blades.2. Raise the deck and secure it in the TILT-UPposition. Refer to CLEANING the Grass Build-up in Mower Deck Housing in this section fordeck raising instructions.DANGERNEVER operate cutter blades with thedeck in the raised position.NOTE: PTO shaft must be disconnected before checking blades for straightness.