ш Thermal shock is caused by a large temperature differential (approx 30 C, 50 F) between the steering unit and hydraulic oil. If the steering is not operated for a long period of time and the orifi ce in the bottom of the priority spool is plugged, the steering unit may bind up when the steering is operated if the hydraulic oil is hot enough. 5-13 Problem Cause Remedy Steering unit locks up Large particles of contamination in steering unit. ø Thermal shock Worn or damaged steering unit. Inspect hydraulic fi lter for contamination. Repair cause of contamination. Flush hydraulic system. Do of MCV SX port fl ow test.
This oil fl ow provides a warm-up fl ow to steering unit when not using the steering. Repair or replace steering unit. Abrupt steering wheel oscillation Improperly timed gerotor gear in steering unit. Time gerotor gear. Steering wheel turns by itself Lines connected to wrong port. Worn or damaged steering unit. Reconnect lines. Repair or replace steering unit. Vibration in steering system or hoses jump High priority valve setting. Do priority valve pressure test. N e u t r a l p o s i t i o n o f steering wheel cannot be obtained, i.e. there is a tendency towards "motoring" Steering column and steering unit out of line.
Too little or no play between steering column and steering unit input shaft. Pinching between inner and outer spools. Align the steering column with steering unit. Adjust the play and, if necessary, shorten the splines journal. Contact the nearest service shop. "Motoring" effect. The steering wheel can turn on its own Leaf springs are stuck or broken and have therefore reduced spring force. Inner and outer spools pinch, possibly due to dirt. Return pressure in connection with the reaction between differential cylinder and steering unit too high. Replace leaf springs. Clean steering unit or contact the nearest service shop. Reduce return pressure. Backlash Cardan shaft fork worn or broken.
Leaf springs without spring force or broken. Worn splines on the steering column. Replace cardan shaft. Replace leaf springs. Replace steering column. Jerky steering Priority spool orifi ce in MCV missing. Sticking spool in cushion valve. Inspect orifi ce. Inspect cushion valve. Flush the spool in cushion valve.