Wheel System, Traction258Service Manual – Advance 7765 / Nilfisk CR1500Maintenance and AdjustmentsWarning! Before performing any machine maintenance or adjustments (other than theHydroback adjustment), make sure the key switch is off, the key is removed from themachine and the parking brake is engaged.Lubrication• Grease the Fitting above the steering rack every 100 hours of operation.• Lubricate the drive wheel, swivel wheel bearings and steering rack guide (engine side above rear wheel).Hydroback Adjustment1. Jack up the rear of themachine to get the drive wheelup off the ground.2. Install safety blocks or standsto support the rear of themachine.3. Start the engine and observethe wheel rotation with theengine idling. If the wheelis rotating either forward orreverse with the drive pedalin the neutral position, adjustthe Hydroback as follows:a. Loosen the two 3/8”-16Screws holding the PintleArm Adjuster.b. Adjust the 3/8”-16 AdjustingScrew until the wheel stopsturning.c. Tighten the two 3/8”-16Screws.Hydroback Adjustment (Gasoline/LPG)3/8”-16Screw (2)Pintle ArmAdjuster3/8”-16AdjustingScrewHydroback Adjustment (Diesel)3/8”-16Screw (2) Pintle ArmAdjuster3/8”-16AdjustingScrew