September 2016 Service ManualHydraulic Power UnitPart No. 38139 AWP Super Series • IWP Super Series 853-5 H ydr aulic Power U nit3-5Hydraulic Power UnitHow to Remove the HydraulicPower Unit - AC Models1 Fully lower the platform.2 Turn the key switch off and disconnect thepower supply.3 IWPS models: Pull the base lowering handleto fully lower the base.4 Remove the power unit cover.5 Tag, disconnect and plug the hydraulic hoses.Cap the fittings on the power unit.Bodily injury hazard. Sprayinghydraulic oil can penetrate andburn skin. Loosen hydraulicconnections very slowly to allowthe oil pressure to dissipategradually. Do not allow oil tosquirt or spray.6 Tag and disconnect the electrical wiring fromthe valve coil.7 Remove the cover from the junction box on themotor. Tag and disconnect the electrical wiringin the junction box. Loosen the squeezeconnector on the junction box and pull thewiring out through the squeeze connector.DC models: Tag and disconnect the electricalwiring from the motor start solenoid.Air models: Tag and disconnect the pneumatichoses from the power unit.8 Support the hydraulic power unit with a liftingdevice.9 Remove the power unit mounting fasteners,then remove the power unit from the machine.Crushing hazard. The power unitwill fall unless it is properlysupported.Note: If a new power unit is installed, the pressurerelief valve must be properly adjusted. See 3-6,How to Adjust the Pressure Relief Valve.
