Komatsu HA940549 User Manual

TROUBLESHOOTING
6-7
HYDRAULIC SYSTEM
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
*) These measures must be performed by your local Komatsu dealer.

Komatsu HA940549 Specifications

General

Brand	Komatsu
Model	HA940549
Category	Compact Loader
Language	English