HYDRAULICS 1.110 HYDRAULIC CYLINDERS Extension cylinder (49) Removal 1. Lower the boom to the horizontal position and extend the boom by 1.5 m (5 ft). 2. Stop the engine and chock the machine, apply the parking brake . 3. Refer to page 1.1 and dump hydraulic pressure then disconnect the battery. The extension cylinder weighs 140 kg (308 lb). take care when handling, to avoid damage to components and injury to personnel. 4. Remove the rear cover from the boom pivot. 5. Identify the hydraulic hoses to make sure they are reconnected correctly. Disconnect the four hydraulic hoses (3) on the bulkhead connector bracket (1) to the crowd cylinder and auxiliary services.
Blank the connectors and open hoses. 6. Remove the two bolts and washer (2) securing the bulkhead connector bracket to the boom (11). Pull the bracket and hoses rearwards to clear the boom. 7. Identify the hydraulic hoses to make sure they are reconnected correctly. Disconnect the two hydraulic hoses (5) from the cylinder (4), blank the cylinder and open hoses. 8. Remove the two circlips (7) retaining the forward attachment pin (8) to the inner boom (6). Drive out the forward attachment pin. NOTE: Make a note of the position of the spigot mounting clamps located on each side of the rear cylinder attachment pin. 1. Bulkhead connector bracket 2. Bolt/washer 3. Crowd/auxiliary hoses 4.
Cylinder (49) 5. Cylinder hoses 6. Inner boom 7. Circlip (2 off) 8. Forward attachment pin 9. Spigot mounting clamp (2 off) 10. Bolt/washer (4 off) 11. Outer boom 9. Remove the two bolts and washers (10), on each spigot mounting clamp (9), securing the rear attachment pin to the outer boom (11). 10. Remove the cylinder rearwards from the boom. Remove the rear attachment pin from the cylinder eye end.