Problems in the hydraulic system and steer- ing | Holder 4.74

Operating instructions

Troubleshooting guide

Problems in the hydraulic system and steer- ing

NOTE

These notes only apply for valve arrange- ments conforming to our circuit diagrams or approved by Bucher Hydraulics.

C 4.74

Problem	Cause	Remedy

Power lift or hydraulic cylinders not	Slide valve in input plate stuck due	Remove and clean slide valve in
lifting. No pressure build-up noticeable	to foreign objects.	input plate LU8SSCS-
(steering working normally).		OM22/04!
		Do not change pressure setting!

Power lift lifting with too little power.	Pressure setting too low	Reset pressure with pressure gauge
		(190 bar).
	Oil level too low.	Fill up specified type of oil

Operating pressure is only reached	Pump defective	Replace pump
with high RPM

Power lift not lifting	Lift cylinder leaky	Clean / replace
Not enough power	Valve leaky
Drops after operation.

142

149 443

Image 143

Holder 4.74 manual Problems in the hydraulic system and steer- ing

Contents

Operating Instructions Development General notes on serviceOperating instructions Foreword Explanation of terminology Date of issue and manual version NovemberForeword Table of contents Page Unintended applications Instructions for the vehicleIntended Use Site of operation Residual hazards and risks Instructions for the vehicle Over 32 km/h Operating instructionsDriver’s licence Driver’s licence classes Operating instructions Operating instructions Operating instructions Work clothing SafetyGeneral notes on safety Safety notes for later installations Gear oil, engine oil, diesel fuel Safety precautions for handling fuels and oils Emissions Exhaust gases Battery acidHydraulic oil, brake fluid Heat Battery Vehicle dimensions Dimensional drawing Technical data Table of dimensions C Technical data Normal track 1040 mm Vehicle Track width e Total width f Dimension TypeTrack widths Tires Weights Max Type Weight Engine specifications Tires Type Technical data Traction hydraulics Trailer hitch Assembly Suppl. information Description SteeringFront power lift Brakes Working hydraulics with Steering Assembly Suppl. information Description Rear power liftLoading platform Vehicle overall Assembly Suppl. information Description PTOsElectrical system Fuel systemPage Exhaust gas identification Noise level Front left view DescriptionViews Vehicle14 Rear right view DescriptionVehicle Operating controls Driver’s station Right front controls console Right rear console controls Hand throttle Rear console controls Pedals Joystick Heater until Steering wheel adjustment Multifunctional display, legend 10 9 8 Controls in cabin at front bottom Controls in cabin at front top Door controls Door opener Controls in cabin at rear Identification plates Location of plates and labels Mounting instructions for licence plates Overview of options and variants selection Assembly Additional information Dimension/Order No./Type Assembly Supplementary information Dimension/Order No./Type Accessories Page Taking into operation Daily checks and services prior to taking into operationCheck and clean the cooler and debris screens Do not fill too much oil Turn on the battery isolating switchTaking into operation Check the engine oil level Check the tire inflation pressure Check the trailer hitch option if required Check the hydraulic oil level Approx L Filling fuel Check the brake fluid level Adjust the steering wheelDo not adjust the steering wheel while driv- ing Do not adjust the seat while driving. Risk of accidents Adjust the driver’s seat with mechanical suspension Adjusting the backrest inclination Adjusting the driver’s seat with pneumatic suspen- sionAdjusting the lumbar padding Adjusting the seat horizontally Adjusting the driver’s weightAdjusting the horizontal suspension Check the lights and rear view mirror Filling washing water Starting the engine Start the engine BildC164 Check the brakes and steering for proper operation Before starting to drive Driving safety rulesOperation Driving with hydrostatic drive and digital electronics OperationDriving Table of driving ranges Operation Stop Selecting on-road travel transport speed Setting the working speed of programs 3 Operating instructions Adjusting the fine control knob Driving with SDS Special Drive System Changing the direction of travel Operating the inching pedalRelease the inching pedal again after passing Obstacle Vehicle will resume the previously selected Speed Disengaging the differential lock Engaging the differential lock Two-stage steering Steering Parking brake is not intended to be used Applying the service brakeBrakes Applying the parking brake Releasing the parking brake An alarm is sounded when driving with Hand brake applied Driving on slopes Uphill Removal of hydraulic oil for stationary operation Special operating instructionsStationary operation Place the vehicle n level ground in both di- rections 215 Nm Adjusting the track widthSpecial operating instructions Engine oil for winter operation Ballast weightsOperation in winter Oil preheating Winter diesel fuelPage Possible implements Safety instructions for handling implementsOperating the implements Additional information on implements Operating the implements Front implement Rear implement or front/rear combinations Operating instructions Attaching implements Adjusting the length of the pintle hook bar Adjusting the pintle hooks and pintle hook bars Both threads must be screwed in equally far Adjusting the upper linkEquipment must not hit the cabin Connecting hydraulic lines Removing implements Installing the cardan shafts Operating the joystick Joystick operation Sideshifting the front power lift Operating the front power liftTilting the front power lift Operating the front power lift with keyboard Operating the tilting device with the keyboard Switching the front power lift to double-acting Operating the sideshift with the keyboard Transport safety External operation of the front power lift Toggle button for Float Position Button Flow limiter for joystick Operating the rear power lift External operation of the rear power lift Operating the hydraulic couplings Operating the yellow and white hydraulic couplings Operating the green hydraulic couplingsOperating the blue hydraulic couplings Turning on the front PTO Turning on the rear PTO Gas pressure in the diaphragm accumu- lator is 30 bar Operating the hydraulic cushioning* front power liftAdjusting the hysteresis Turning the implement cushioning off Driving on-road with implement cushioningOperation with implement cushioning 102 Operating the implements Turning off the implement variable-displacement Pump Make sure no-one is standing in the danger zone at the rear Operating the hydraulic dumper Slowly increase the speed of the engine Operating priority flow valvePress button 4 only at low engine speed Turning off the priority flow valve Press button 3 only at low engine speed 109 Page Removing the roof hatch Other activitiesOperating the driver’s cab Operating the roof hatch Opening the roof hatch Front windshield wiper/washer Other activitiesTurning on windshield wiper/washer Turning on high beam Turn the preheat/starter switch to positionLights Turning on and operating the lights 13 14 Operating the horn Signalling to the left, signalling to the rightTurning on the top headlights Turning on the rotating beacon Operating the hazard warning flasher system Interior light Turning on the interior light Turning on the flood lightFlood light must not be used in the public traffic area Radio* and loudspeakers Operating the radio Power socket Connecting equipment to the power socket Heating and ventilating Turning on the heater Heater Fresh air blower has 2 speeds Turning on the ventilation Air conditioning Cleaning the condenserAir conditioning Operating the air conditioning Vehicle fuses Fuses 123 Page Stopping Taking out of operationLeaving the vehicle Leaving the vehicle Taking out of operationShutdown Do not leave the cabin without taking the ig- nition key Trailers, towing Bearing load Trailers, towingOperating the trailer hitch manually, attaching trailers Trailer hitch must be completely closed Driving with trailers Do not step or stand under a suspended load. Danger Transport, hoisting, towingInstructions for transport Hoisting instructions Towing instructions Transport, hoisting, towing Brake cable is very taut risk of injury Secure the vehicle against rolling with chocksPage Adjusting the speedometer Indicators, adjustmentsPage Problem Cause Remedy Troubleshooting guideProblems in engine and exhaust gas turbo Problems in electronic and hydraulic driving systems Troubleshooting guide Troubleshooting guide Cause Remedy 141 Problems in the hydraulic system and steer- ing 143 Problems in the working hydraulic system 145 146 147 Page How to value the vehicle? General remarks on maintenanceQualification of service personnel Service Service Hours Date Signature Interval Operation General remarks on maintenanceFollowing services were carried out Handling fuels and lubricants Safety notes for maintenance 152 Work on the electrical system Disconnect the battery ground lead Jacking up Jack lift points To lower it, return the changeover lever 1 to the left Securing the dump body loading platform Raise the cabin carefully Tilting the cab Maintenance after the first 500 hours Maintenance schedule Maintenance every 500 hours Maintenance schedule Annual maintenance Maintenance every 1500 hoursMaintenance every 3000 hours Page Check the engine for leaks Maintenance during the first period of operationMaintenance after the first 50 hours Page Adjusting the speedometer Maintenance as required Switch layout Tire size Combination Maintenance as required Replacement CleaningPage Check the cooling system Periodic maintenance Maintenance every 125 hoursClean the cooling system Clean with compressed air Clean with cold cleaner or pressure washer Check the high pressure hoses Maintenance every 125 hoursCheck the battery and cable terminals Check the brake fluid level for the foot brake Check the steering cylinder and orbitrol Do not operate the vehicle with a defective braking system Check the braking system Grease the vehicle 215 Nm Check the electrical system Tighten nuts and boltsTighten wheel nuts Clean the fresh air filter Page Litres Maintenance every 500 hoursChange the engine oil Observe the instructions for handling fuels and lubricants Check hose couplings for leaks Maintenance every 500 hoursChange the engine oil filter Check the heating system Page Check engine valve clearances Maintenance every 1000 hoursCheck the battery Check V-belt tension and condition Maintenance every 1000 hoursService V-belts only with the engine station- ary Fuel system is bled automatically Clean / replace the fuel pump strainerChange the fuel filter and fuel prefilter Do not inject too much grease to prevent damage to the seal Lubricating the cardan joint nipples Change the hydraulic oil while at operating temperature Maintenance every 1500 hours Change Maintenance every 1500 hoursClean Matically Air in the hydraulic system is bled autoPage Change the toothed belt Maintenance every 3000 hoursCheck the injection nozzles Page Change the brake fluid of the foot brake Annual maintenancePage Engine preservation Putting the vehicle back in service after lay-upLaying up Remove engine preservation Laying up Fuel and lubricant recommendations Greases Fuel and lubricant recommendationsRecommended engine oils and greases Manufacturer Lubricating oil type Fuels Brake fluidDo not use mineral oil Page Filling quantities Maintenance data Tightening torques Hexagon screws and studs Maintenance data List of replacement parts Description Order No Bulbs 12 Lights Rating Maintenance data 202 100 Alphabetical index 118 Alphabetical index 205 206 207 208 209 210