307E2 Mini Hydraulic Excavator Machine Systems Heating and Air Conditioning Unit - Remove Caterpillar

Removal Procedure

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Personal injury can result from contact with refrigerant. Contact with refrigerant can cause frost bite. Keep face and hands away to help prevent injury. Protective goggles must always be worn when refrigerant lines are opened, even if the gauges indicate the system is empty of refrigerant. Always use precaution when a fitting is removed. Slowly loosen the fitting. If the system is still under pressure, release it slowly in a well ventilated area. Personal injury or death can result from inhaling refrigerant through a lit cigarette. Inhaling air conditioner refrigerant gas through a lit cigarette or other smoking method or inhaling fumes released from a flame contacting air conditioner refrigerant gas, can cause bodily harm or death. Do not smoke when servicing air conditioners or wherever refrigerant gas may be present. Use a certified recovery and recycling cart to properly remove the refrigerant from the air conditioning system.

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At operating temperature, the engine coolant is hot and under pressure. Steam can cause personal injury. Check the coolant level only after the engine has been stopped and the fill cap is cool enough to touch with your bare hand. Remove the fill cap slowly to relieve pressure. Cooling system conditioner contains alkali. Avoid contact with the skin and eyes to prevent personal injury.

Start By:

1. Remove the cab.

2. Remove the seat.

1. Drain the cooling system. Refer to Operation and Maintenance Manual, Cooling System Coolant (ELC) - Change for the correct draining procedure.

2. Recover the refrigerant. Refer to Service Manual, SENR5664, All Products Air Conditioning and Heating R134a for All AVSpare Machines for the recovery procedure. Refer to Special Publication, NENG2500, Air Conditioning Tools for the correct tools.
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   Illustration 1	g06009804

3. Disconnect harness assemblies (1) and place harness assemblies (1) to the side.
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   Illustration 2	g06009808

4. Remove bolt (3) and clip (2).
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   Illustration 3	g06009843

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   Illustration 4	g06010090

5. Remove bolt (4), not shown. Remove bolt (6) and bolt (7).

6. Lay left side console assembly (5) to the side.
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   Illustration 5	g06010037

7. Cut cable straps (8).
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   Illustration 6	g06010236

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   Illustration 7	g06010253

8. Remove pin (12). Remove armrest (10).

9. Collapse the base of boot (9). Relocate collapsed boot (9) through opening (11) as you disconnect cover (13) from the console assembly.

10. Lay cover (13) to one side to access the harness assemblies beneath cover (13).
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    Illustration 8	g06010282

11. Disconnect harness assemblies (14).
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    Illustration 9	g06010107

12. Cut cable straps (15). Remove sleeve (16). Carefully pull harness assemblies (14) out of console assembly (5).
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    Illustration 10	g06010044

13. Remove bolts (17) and lay front panel (18) down.
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    Illustration 11	g06015270

14. On the back of front panel (18), disconnect harness assemblies (19) from hour meter (20).
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    Illustration 12	g06015340

15. Cut all cable straps (21) that secure harness assemblies (22) to the floor plate. When you remove the heating and air conditioning unit, harness assemblies (22) remain attached to the heating and air conditioning unit.
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    Illustration 13	g06015349

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    Illustration 14	g06015352

16. Remove bolts (23) and recessed bolt (24).
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    Illustration 15	g06015360
    Rear of blade valve (25).

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    Illustration 16	g06015362
    Front of blade valve (25).

17. Disconnect harness assembly (26). Remove rear bolt (27) and front bolt (28). Lay blade valve (25) to the side.
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    Illustration 17	g06015370

18. Disconnect harness assembly (29) from sensor (30).
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    Illustration 18	g06015397

19. Disconnect hose assemblies (32) from pilot valve (31). Hose assemblies (32) remain with the machine when the heating and air conditioning unit is removed.
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    Illustration 19	g06015650

20. Remove screws (34) and duct (33).
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    Illustration 20	g06015677

21. Cut cable strap (36) that secures harness assemblies (35) to the floor plate. When you remove the heating and air conditioning unit, harness assemblies (35) remain attached to the heating and air conditioning unit.
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    Illustration 21	g06015766

22. Remove bolts (37) from the front, left side of the seat support.
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    Illustration 22	g06015730

23. Remove bolts (38) on the front, right side of the seat support.
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    Illustration 23	g06019089

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    Illustration 24	g06016507

24. On the left side of the heating and air conditioning unit, reposition wire harnesses (40A) and remove bolt (40) and bolt (39).
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    Illustration 25	g06016544

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    Illustration 26	g06016548

25. On the rear of the seat support, remove bolt (41) and bolt (42).
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    Illustration 27	g06016554

26. Use Tooling (A) and a suitable lifting device to remove seat support (43).

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Illustration 28	g06016636

1. Remove bolt (46) and clamp (44). Disconnect hose assembly (45) and hose assembly (47).
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   Illustration 29	g06016937

2. Disconnect hose (48) and hose (49).
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   Illustration 30	g06016942

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   Illustration 31	g06016954

3. Remove bolt (51), bolt (52), and bolt (53). Remove heating and air conditioning unit (50).