troubleshooting

trained, studying dosing pump design and service and dosing pump assembly-disassembly manuals, and provided they have all required service tools, accessories and special hydraulic stand, ensuring adjustment and check of dosing pump parameters and operability after the repairs have been made. Otherwise a person performing dosing pump assembly and disassembly, replacement of parts and components or adjustment of valves, as well as tractor owner, bears full responsibility for dosing pump nonoperability.

7.13 Possible failures in the electronic control system of RLL and guidelines for troubleshooting

Cables and control system of RLL connecting diagrams is shown in Figures 7.13.1, 7.13.2. Rules of failure diagnostics of the RLL ECS are specified in clause 2.15.4 “Troubleshooting of RLL electronic control system” of subsection 2.15 “Lift linkage controls”. Possible RLL electronic control system errors codes and guidelines for troubleshooting are shown in Table 7.13.

ATTENTION: DISCONNECTION OF THE ELECTRIC SOCKETS OF THE REAR LIFT LINKAGE ELECTRONIC CONTROL SYSTEM SHALL BE CARRIED OUT WHEN THE ENGINE IS NOT RUNNING ONLY!

ATTENTION: ALTERATIONS OF THE SPECIFIED VOLTAGE VALUES SHALL BE DONE WITH THE ENGINE RUNNING, WITH DUE ATTENTION TO THE SAFETY MEASURES IF OPERATING WITH ELECTRIC UNITS ON LOAD!

ATTENTION: TERMINALS IN THE CABLE SOCKETS ARE NUMBERED ON THE SOCKETS SHELLS!

ATTENTION: REPAIR OPERATIONS OF THE REAR LIFT LINKAGE AND FRONT LIFT LINKAGE ELECTRONIC CONTROL SYSTEM SHALL BE CARRIED OUT ONLY BY DEALERS. OTHERWISE THE WARRANTY FOR THE REAR LIFT LINKAGE AND FRONT LIFT LINKAGE CONTROL SYSTEM BECOMES INVALID!

Error code Description, anticipated problem

11 Failure in the electromagnetic lift valve control circuit 9 (Figure 3.18.1). Break in the solenoid coil or in solenoid control cable

12

13

14

15 Failure in the electromagnetic lowering valve control circuit. Break in the solenoid coil 7 (Figure 3.18.1) or in solenoid control cable

Failure in the electromagnetic lowering valve or lift valve control circuit. Short circuit in one of the solenoids or short circuit of the solenoids control wires in the cable (Figure 3.18.1) Failure in remote control buttons for lift 4 (Figure 2.15.3). Short circuit of wires or sticking of a remote control buttons for lift

Failure in remote control buttons for lowering 5 (Figure 2.15.3). Short circuit of wires or sticking of a remote control buttons for lowering Failure inspection method

Complex defects

Disconnect the cable from the solenoid and test the solenoid with a testing apparatus to detect a break. Solenoid resistance shall not exceed 2...4 Ohm. In case the solenoid failure is not detected check the solenoid control cable for mechanical damage, and check the wire with the testing apparatus to detect if there is a break between the solenoid socket terminal and the terminal 2 of 25-pole socket of the electronic unit (Figures 7.13.1, 7.13.2) Disconnect the cable from the solenoid and test the solenoid with a testing apparatus to detect a break. Solenoid resistance shall not exceed 2...4 Ohm. In case the solenoid failure is not detected check the solenoid control cable for mechanical damage, and check the wire with the testing apparatus to detect if there is a break between the solenoid socket terminal and the terminal 14 of 25-pole socket of the electronic unit (Figures 7.13.1, 7.13.2) Disconnect the cable from the solenoid and test the solenoid with a testing apparatus to detect a short circuit. Solenoid resistance shall not exceed 2...4 Ohm. Or measure the solenoid useful current applying the current of 6 V. The current shall not exceed 3.2A. Disconnect the socket from the electronic unit, check the terminals 2 and 14 for a short circuit (the solenoids shall be disconnected during this procedure) (Figures 7.13.1, 7.13.2) Check the remote control buttons cables for mechanical damage by lift of RLL. Disable each button for lift one-by-one until the failure is gone. Stop the engine when you disable the buttons. If the failure is still not eliminated, disconnect the socket from the electronic unit and ring out the terminals 10 and 12 for a short circuit by testing apparatus (Figures 7.13.1, 7.13 Check the remote control buttons cables for mechanical damage by lift of RLL. Disable each button for lift one-by-one until the failure is gone. Stop the engine when you disable the buttons. If the failure is still not eliminated, disconnect the socket from the electronic unit and ring out the terminals 20 and 12 for a short circuit by testing apparatus (Figures 7.13.1, 7.13

Continuation of Table 7.13 Error code Description, anticipated problem

16 Failure in electronic unit. Stabilized power supply voltage, powering the control panel is lower than the required level. Short circuit may occur in the force and position sensors sockets of RLL (Figure 3.18.1) caused by water entering the sockets Disconnect the main control panel from the common cable. Measure stabilized power supply voltage of the terminals 6 (minus) and 4 (plus) of the control panel socket, which shall make 9.5 - 10 V (with the engine running). If the supply voltage is low or in absence of it, check the reliability of electronic unit socket connection. Disconnect the force sensor and the position sensor of RLL one-by one (Figures 3.18.1, 7.13.2)

22 Failure of the position sensor 8 (Figure 3.18.1). Break of the sensor wire, the sensor was not connected or adjusted 1. Faulty adjustment of the position sensor. Disconnect the cable socket from the sensor. Unscrew the sensor. Lift the LL in an uppermost position by remote buttons or button “lift” on the solenoid (bottom solenoid). Screw the sensor in by hand as far as it may go and unscrew by 2 turns. Connect the cable socket to the sensor. Lower and lift in an uppermost position the LL by means of the control panel. Lift indicator shall be out. If the indicator is still flashing, make the position sensor further by 1/6 of a turn. Check the system operation again. If it is necessary (lift indicator is not out in an uppermost position), make the position sensor a little bit further and try to check again. If the adjustment was made in a proper manner, LL shall be lowered and lifted by means of the control panel to the extreme positions. The lift indicator shall be out in an uppermost position . Failure of the position sensor. 2.1 To check the operability of “BOSCH” position sensor, dismount it from the tractor. According to the electric circuit diagram of the RLL control system (figure 6.12.2, the position sensor connection), it is required to supply voltage of 10V (in case the power supply unit is not available, voltage of 12V can be supplied from the accumulator battery for a short moment) to: output 1 “load” (minus) and to output 3 “+” (plus) and pressing the sensor migrating rod by a finger, measure the voltage at the sensor output by the testing apparatus: between output 2 – “signal” and output 1 – “minus”. While the full sensor rod (core) shifting, the voltage at the sensor output shall be measured within the limits from 0.2 to 0.75 of the value of voltage supplied to the sensor. If the specified parameters are broken, it is required to mount a new sensor on the tractor and adjust it properly. Numbers of sensor outputs are indicated on the cable socket connector which is attached to the position sensor. 2.2 It is impossible to check the -01 sensor manufactured by the works “Izmeritel”, operability by means

Failure inspection method

Moderate defects

Table 7.13 finished of dismounting it from the tractor. If carrying out adjustments failed to eliminate the -01 sensor failure, it is required to mount a new -01 sensor on the tractor and adjust it properly. 3. Failure (break) in the cable in the sensor circuit. Check the cable according to the diagram (Figure 7.13.2)

Error code Description, anticipated problem Failure inspection method

23 Failure of the control panel. Potentiometer of the depth control lever is damaged

24 Failure of the control panel. The RLL uppermost end position lever is damaged

28 Failure of the control panel. The RLL operation lever 7 (Figure 2.15.1) is damaged

31

32 Failure of the right force sensor 10 (Figure 3.18.1). Cable breaking or the sensor short circuit

Failure of the left force sensor 11 (Figure 3.18.1). Cable breaking or the sensor short circuit

34

36 Failure of the control panel. Potentiometer of the RLL speed control lever is damaged

Failure of the control panel. Potentiometer of tilling modes combination lever: force mode – pointto-point operation mode Check the reliability of the control panel sockets and electronic unit connection, and check the cable for mechanical damage. Check the voltage output according to the electrical connections diagram (Figure 7.13.2) Check the reliability of the control panel sockets and electronic unit connection, and check the cable for mechanical damage. Check the voltage output according to the electrical connections diagram (Figure 7.13.2) Check the reliability of the control panel sockets and electronic unit connection, and check the cable for mechanical damage. Check the voltage output according to the electrical connections diagram (Figure 7.13.2) To check if it is failure of the sensor or the cable (in circuit to the sensor), disconnect the sockets from the cable to the sensors (left and right) and interchange their positions (the socket from the left sensor to the right sensor channel and the socket from the right sensor to the left sensor channel). If after that the error code has changed (31 was replaced by 32 or 32 was replaced by 31), that means that the sensor is out of order, if the error code is still the same, that means that the cable is out of order

Easy defects

Check the reliability of the control panel sockets and electronic unit connection, and check the cable for mechanical damage. Check the voltage output according to the electrical connections diagram (Figure 7.13.2) Check the reliability of the control panel sockets and electronic unit connection, and check the cable for mechanical damage. Check the voltage output according to the electrical connections diagram (Figure 7.13.2)

Code is not displayed Spontaneous lift of RLL after the engine start “Lift” forward/reverse spool was blocked abroach. Disconnect the cable sockets from the “Lifting” and “Lowering” solenoids. If the failure is still displayed, eliminate the failure in the RLL hydraulic system.

Figure 7.13.1 – RLL electronic control system cables

Figure 7.13.2 – Electrical circuit diagram of RLL control system