Problems in the working hydraulic system | Holder 4.74 manual

Operating instructions

Troubleshooting guide

Problems in the working hydraulic system

The diagnostic unit OPUS and PC software are available as options with which further troubleshooting/diagnosis/ad- justment of the electronics in the working hydraulic system is possible.

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

All hydraulic functions not active	Control unit (box) without power	Turn on main switch (toggle switch)
	Connector or cable set defective	Repair or replace connectors, cables
	Control unit defective,	Replace
	watch flashing code of LED on box

Individual functions not active	Function disabled	Enable with Opus or PC software, also
		see operating instructions.
	Connectors or cables damaged	Repair or replace
	Solenoid or valve defective	Repair or replace

144

149 443

Image 145

Holder 4.74 manual Problems in the working hydraulic system

Contents

Operating Instructions Operating instructions General notes on serviceForeword Development Foreword Date of issue and manual version NovemberExplanation of terminology Table of contents Page Intended Use Instructions for the vehicleSite of operation Unintended applications Residual hazards and risks Instructions for the vehicle Driver’s licence Operating instructionsDriver’s licence classes Over 32 km/h Operating instructions Operating instructions Operating instructions General notes on safety SafetySafety notes for later installations Work clothing Gear oil, engine oil, diesel fuel Safety precautions for handling fuels and oils Hydraulic oil, brake fluid Battery acidEmissions Exhaust gases Heat Battery Vehicle dimensions Dimensional drawing Technical data Table of dimensions C Technical data Track widths Tires 1040 mm Vehicle Track width e Total width f Dimension TypeNormal track Weights Max Type Weight Engine specifications Tires Type Technical data Traction hydraulics Front power lift Assembly Suppl. information Description SteeringBrakes Trailer hitch Loading platform Assembly Suppl. information Description Rear power liftWorking hydraulics with Steering Electrical system Assembly Suppl. information Description PTOsFuel system Vehicle overallPage Exhaust gas identification Noise level Views Vehicle14 DescriptionFront left view Vehicle DescriptionRear right view 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 Check and clean the cooler and debris screens Daily checks and services prior to taking into operationTaking into operation Taking into operation Turn on the battery isolating switchCheck the engine oil level Do not fill too much oil Check the tire inflation pressure Check the trailer hitch option if required Check the hydraulic oil level Approx L Filling fuel Do not adjust the steering wheel while driv- ing Adjust the steering wheelCheck the brake fluid level Do not adjust the seat while driving. Risk of accidents Adjust the driver’s seat with mechanical suspension Adjusting the lumbar padding Adjusting the driver’s seat with pneumatic suspen- sionAdjusting the backrest inclination Adjusting the horizontal suspension Adjusting the driver’s weightAdjusting the seat horizontally 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 Operation Driving safety rulesBefore starting to drive Driving OperationDriving with hydrostatic drive and digital electronics 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 Release the inching pedal again after passing Operating the inching pedalObstacle Vehicle will resume the previously selected Speed Changing the direction of travel Disengaging the differential lock Engaging the differential lock Two-stage steering Steering Brakes Applying the service brakeApplying the parking brake Parking brake is not intended to be used Releasing the parking brake An alarm is sounded when driving with Hand brake applied Driving on slopes Uphill Stationary operation Special operating instructionsPlace the vehicle n level ground in both di- rections Removal of hydraulic oil for stationary operation Special operating instructions Adjusting the track width215 Nm Operation in winter Oil preheating Ballast weightsWinter diesel fuel Engine oil for winter operationPage Operating the implements Safety instructions for handling implementsPossible 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 Equipment must not hit the cabin Adjusting the upper linkBoth threads must be screwed in equally far Connecting hydraulic lines Removing implements Installing the cardan shafts Operating the joystick Joystick operation Tilting the front power lift Operating the front power liftSideshifting 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 blue hydraulic couplings Operating the green hydraulic couplingsOperating the yellow and white hydraulic couplings Turning on the front PTO Turning on the rear PTO Adjusting the hysteresis Operating the hydraulic cushioning* front power liftGas pressure in the diaphragm accumu- lator is 30 bar Operation with implement cushioning Driving on-road with implement cushioningTurning the implement cushioning off 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 Press button 4 only at low engine speed Operating priority flow valveSlowly increase the speed of the engine Turning off the priority flow valve Press button 3 only at low engine speed 109 Page Operating the driver’s cab Other activitiesOperating the roof hatch Opening the roof hatch Removing the roof hatch Turning on windshield wiper/washer Other activitiesFront windshield wiper/washer Lights Turning on and operating the lights Turn the preheat/starter switch to positionTurning on high beam 13 14 Turning on the top headlights Signalling to the left, signalling to the rightOperating the horn Turning on the rotating beacon Operating the hazard warning flasher system Flood light must not be used in the public traffic area Turning on the flood lightInterior light Turning on the interior light 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 condenserOperating the air conditioning Air conditioning Vehicle fuses Fuses 123 Page Leaving the vehicle Taking out of operationStopping Shutdown Taking out of operationDo not leave the cabin without taking the ig- nition key Leaving the vehicle Trailers, towing Operating the trailer hitch manually, attaching trailers Trailers, towingBearing load Trailer hitch must be completely closed Driving with trailers Instructions for transport Transport, hoisting, towingHoisting instructions Do not step or stand under a suspended load. Danger 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 Problems in engine and exhaust gas turbo Troubleshooting guideProblems in electronic and hydraulic driving systems Problem Cause Remedy 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 Qualification of service personnel General remarks on maintenanceService How to value the vehicle? Following services were carried out General remarks on maintenanceService Hours Date Signature Interval Operation 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 Maintenance every 3000 hours Maintenance every 1500 hoursAnnual maintenance Page Maintenance after the first 50 hours Maintenance during the first period of operationCheck the engine for leaks Page Adjusting the speedometer Maintenance as required Switch layout Tire size Combination Maintenance as required Replacement CleaningPage Clean the cooling system Clean with compressed air Periodic maintenance Maintenance every 125 hoursClean with cold cleaner or pressure washer Check the cooling system Check the battery and cable terminals Maintenance every 125 hoursCheck the high pressure hoses 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 Tighten wheel nuts Tighten nuts and bolts215 Nm Check the electrical system Clean the fresh air filter Page Change the engine oil Maintenance every 500 hoursObserve the instructions for handling fuels and lubricants Litres Change the engine oil filter Maintenance every 500 hoursCheck hose couplings for leaks Check the heating system Page Check the battery Maintenance every 1000 hoursCheck engine valve clearances Service V-belts only with the engine station- ary Maintenance every 1000 hoursCheck V-belt tension and condition Change the fuel filter and fuel prefilter Clean / replace the fuel pump strainerFuel system is bled automatically 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 Clean Maintenance every 1500 hoursChange Matically Air in the hydraulic system is bled autoPage Check the injection nozzles Maintenance every 3000 hoursChange the toothed belt Page Change the brake fluid of the foot brake Annual maintenancePage Laying up Putting the vehicle back in service after lay-upEngine preservation Remove engine preservation Laying up Fuel and lubricant recommendations Recommended engine oils and greases Fuel and lubricant recommendationsManufacturer Lubricating oil type Greases Do not use mineral oil Brake fluidFuels 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