TROUBLESHOOTING HYDRAULIC SYSTEM *) These measures must be performed by your local Komatsu dealer.
6-7 HYDROSTATIC DRIVE UNIT FAULT CAUSES REMEDY Machine does not drive Parking brake applied Release parking brake Driving direction switch in position 'N 'Set driving direction switch to either position 'F' or 'R' Driving direction switch without func- tion *) Check function of driving direction switch Oil level in hydraulic oil tank too low Top off hydraulic oil Machine does only drive slowly and performance is poor Hydrostatic motor motor does not swivel Check hydrostatic motor for contami- nation; clean dirty hydraulic motor *) Check function of hydrostatic motor On-off-valve without function *) Check function of on-off valve; replace defective on-off-valve Hydrostatic pump defective *) Replace hydrostatic pump Wrong control pressure *) Check control pressure; reset, if required Wrong high pressure *) Check high pressure; reset, if required Inch valve defective or set incorrectly *) Check setting of inch valve *) Replace defective inch valve Hydraulic filter dirty Replace filter element of hydraulic filter Switching relay without function *) Check function of switching relay; repair or replace defective switching relay Hydrostatic drive unit overheated Faulty operation of charge pump *) Check function (pressure) of charge pump Hydraulic oil radiator (radiator sur- faces, fins) dirty Clean hydraulic oil radiator (radiator surfaces, fins) Faulty fan operation Check tension of drive belt Hydraulic filter dirty Replace filter element of hydraulic filter Oil level in hydraulic oil tank either too high or too low Correct oil level in hydraulic oil tank