2022.3-0000010 OM 7.15.8.29 The pilot lamp of hydraulic-brake fluid low level in the tanks of brake control system activates on the pilot lamps unit HG1 when the system is filled up. ) Check sensor operability of hydraulic-brake fluid SL1 level for which it is required to remove the socket from the sensor. If the lamp goes out – replace the sensor. If the lamp does not go out, check the circuit operability in the system sensor – pilot lamp PLU HG1 for presence of locking on tractor body. If the circuit is short cut – eliminate the failure. b) If the sensor SL1 and the electrical circuit sensor SL1– pilot lamp PLU HG1 operate properly (there is no locking) – replace the pilot lamps unit. 7.15.8.30 The pilot lamp of heating plugs operation signaling in the pilot lamps unit HG1 does not operate while heating plugs operate normally. Lock the contact of HP pilot lamp activation in PLU for tractor “load” by means of a bonding strip for a short period. In case the lamp does not activate, check supply voltage availability of PLU. If there is no supply voltage – replace the PLU. If there is no supply voltage, eliminate the circuit breakage from fuse block F5 to the PLU. 7.16 Possible failures of air-conditioning and cab heating systems and guidelines for troubleshooting List of possible failures of air-conditioning and cab heating systems and guidelines for troubleshooting are shown in Tables 7.16 and 7.16b. Table 7.16b – Possible failures of air-conditioning and cab heating systems and guidelines for troubleshooting Failure, external manifestations, Troubleshooting cause Warm air is not supplied into the cab Coolant is not circulated through heating unit: - turn over heater control valve
Open heater control valve
- heater fan is out of operation
Correct fan trouble, check electric circuit of fan switching on according to electrics diagram in Annex B.
Warm air of high humidity is supplied into the cab Leakage of coolant in heating ra- Stop leakage or replace heating radiator diator Leakage of coolant in heating sys- Tighten up coupling bands tem connection WARNING: DURING TRACTOR DISCONNECTION CLOSED-CIRCUIT AIR CONDITIONING SYSTEM MAY BE DETACHED BY MEANS OF SEPARATION OF QUICK DISCONNECT COUPLER. DISCONNECTION SHOULD BE PERFORMED BY UNSCREWING OF CAP NUT “B” (FIGURE 7.16.1) (WITH HEXAGON SCREW KEY SIZE 30MM) FROM VALVE "A" (WITH HEXAGON SCREW KEY SIZE 29 MM)! WHILE CONNECTING THE DUCT IT IS NECESSARY TO PUT SILICONE SEALANT ON THE THREAD. AFTER THREE OR FIVE DISCONNECTIONS A LEAKAGE CAN OCCUR IN JUNCTION POINT – REPLACE IT IN THIS CASE! WARNING: WHILE DISCONNECTION AND CONNECTION OF DUCTS WEAR PROTECTIVE GLOVES AND GLASSES! 343
