SWDM40 OPERATION & MAINTENANCE MANUAL
8.5.7 Visual Inspection of Air Intake System
Observe engine air intake & exhaust system for black smoke or other abnormality, if found,
maintain this system.
FIG. 8-5-3 Air intake/ exhaust system
8.5.8 Checking Wiper
1）Check wiper every week.
2）Check wiper brush. Replace immediately if abrasion or damage is found.
8.5.9 Checking Front Window Clean Device
1）Check liquid level in windshield wash tank. If it’s low, open the cap to add detergent.
2）In winter, anti-freeze detergent for windshield should be used.
8.5.10 Changing Slewing Bearing of Servo-frame
1） Uninstall Kelly from the drilling machine, remove servo-frame from the Kelly, place the
frame as the figure.
2）Rotate thin thread (1) and nut(2) with open wrench and pneumatic wrench anticlockwise to
loosen about one circle.
3）Uninstall thin thread (1), nut (2), washer (3) and bolt (4), then put it together safely. And
remove other tightening parts successively.
4）Remove slewing bearing (5), pay attention to fixed protection of servo-frame body.
5）Erect the servo-frame and fix it.
6）Install new slewing bearing along with the level direction and servo-frame body (6) to the
correct position.
7）Fix slewing bearing (5) and servo-frame body at three places, among which is 120°, with nut
（1）, nut (2), washer (3), bolt (4).
8）Install nut (1), nut (2), washer (3), bolt (4) onto other mounting hole and tighten as required
torque.
9） Rotate slewing bearing (5) by hands to check abnormality or stuck, if not smooth, apply
grease to the oil filler.
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