UPPERSTRUCTURE / Swing Device Disassemble Swing Motor IMPORTANT: Do not damage the mating surfaces when separating valve plate (18) from valve casing (25) by using a screwdriver. 6. If valve plate (18) is still attached in step 5, remove valve plate (18) from the rotor. Remove springs (17) (20 used) from brake piston (16). 7. Attach special tool (ST 7288) onto the brake piston (16) groove and hoist brake piston (16) straightly. CAUTION: The swing motor assembly weight: 71 kg (157 lb) IMPORTANT: Do not disassemble relief valve (29). 1. Remove relief valves (29) (2 used) from valve casing (25). : 41 mm 2. Remove plugs (21) (2 used). : 17 mm 3.
Remove springs (23) (2 used) and poppets (24) (2 used) from valve casing (25). 4. Remove socket bolts (1) (3 used). Remove swing parking brake switch valve (2) from casing (3). ST 7288 : 5 mm 5. Put the matching marks on the jointed part between valve casing (25) and casing (3). Remove socket bolts (26) (4 used). Remove valve casing (25) from casing (3). : 17 mm NOTE: Check that valve casing (25) is floated by spring (17). When removing valve casing (25), valve plate (18) may be removed together. Do not drop valve plate (18). W1HH-02-06-006 8. Remove O-rings (14, 15) from casing (3). W2-6-21 ST 16