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Always wear goggles when working on air conditioning systems. The system is under pressure at all times, engine running or not. Escaping Freon-12 (C C12F2 Dichloro Difluoro Methane) can cause freezing of human flesh.Do not smoke while working on air conditioning systems. Inhaling Freon-12 through any smoking material, although not toxic or flammable, can generate phosgene gas and cause violent illness. Also, heat must never be applied to a charged system. See Air Conditioning And Heating Service Manual, Form No. SENR3334, for more information on removal and installation of lines and refrigerant from the system.
2. Release the pressure in the air conditioning system. See the topic, Purging The System, in Air Conditioning And Heating Service Manual, Form No. SENR3334.3. Remove the lines from the air conditioning compressor.
At operating temperature, the water lines are hot and under pressure. Before removing any lines, allow the machine to cool and bleed the pressure from the lines. Hot water can cause severe personal injury.
At operating temperature, the hydraulic lines are hot and under pressure. Before removing any lines, allow the machine to cool and bleed the pressure from the lines by slowly removing the caps from all of the hydraulic tanks. Hot hydraulic oil can cause severe personal injury.
Before removing any air lines, bleed the air pressure from the air tank. Compressed air can cause severe personal injury. See 994 Wheel Loader Operation & Maintenance Manual, Form No. SEBU6329.
4. Remove all water lines, as necessary, to remove the engine.5. Remove all hydraulic lines, as necessary, to remove the engine.6. Remove all air lines, as necessary, to remove the engine.7. Bleed the pressure and remove all fuel lines, as necessary, to remove the engine.8. Remove all electrical wiring, as necessary, to remove the engine.9. Remove all clips, wire ties, etc., as necessary, to remove the engine.
In the following Step, support must be provided for the torque converter end of shaft (6). If shaft (6) is accidently pulled out of rear pump drive (7), it may fall and could cause personal injury.
10. Fasten a lifting device or provide support for the torque converter end of shaft (6), in case the shaft is accidently pulled out of rear pump drive (7). Slide shaft (6) away from the engine until the shaft is clear of the engine. 11. Attach a lifting device and remove hood support (1) from both sides of the engine. The weight of support (1) is approximately 55 kg (120 lb). 12. Attach lift fixture (A) to the lift eyes on the engine and support the weight of the engine with a hoist. 13. Remove four bolts and washers (2) from the front engine support. Engine shown removed for photographic purposes.14. Remove bolts (3) from the pump drive adaptor flange.15. Remove six bolts (4) from both sides of the engine.16. Check to be sure that all lines are removed and nothing will interfere with the removal of the engine.17. Move the engine forward to clear the rear pump drive. Remove the engine. The weight of the engine is approximately 7430 kg (16,340 lb). The following steps are for installing the engine. 18. Put front engine mount cushions (5) in position on the frame. Be sure mounting surfaces are free from paint or dirt.19. Attach a lifting device to lift fixture (A) and put the engine in position. 20. Install six bolts (4) on both sides of the engine.21. Install bolts (3) that fasten the rear pump drive to the engine. 22. Install four bolts (2), nuts and washers. 23. Install hood support (1) on both sides of the engine. 24. Install drive shaft (6) into the engine [from the torque converter side of pump drive (7)]. It may be necessary to remove the block at the bottom of the flywheel and use a pry bar to turn the flywheel as an aid to align the splines of shaft (6).25. Install all water lines, as necessary, to install the engine.26. Install all hydraulic lines, as necessary, to install the engine.27. Install all air lines, as necessary, to install the engine.28. Install all fuel lines, as necessary, to install the engine.29. Install all electrical wiring, as necessary, to install the engine.30. Install all clips, wire ties, etc., as necessary, to install the engine.31. Connect the batteries.End By:a. install torque converter *b. install fan and fan guardc. install radiator and radiator guardd. install belly guards ***See 994 Wheel Loader Power Train, Disassembly And Assembly, Form No. SENR4747.**See 994 Wheel Loader Vehicle Systems, Disassembly And Assembly, Form No. SENR4755.