5. OPERATION & MAINTENANCE 5.1. Self- lubricating bearings are used in this drilling rig as journal bearings. Cautions:5.1.1 Use spindle oil for eleaning , avoid using gasoline or kerosene.5.1.2 Prees fit the bearing with a mandrel slowly, or beat it in indirectly & slightly spacing with a wood block, avoid beating on the bearing itself.5.1.3 If the inner diameter of the bearing reduced after pressing fit, use a reamer to ream it out, avoid grinding and filing (except non – slip surface).5.1.4 It is better to dip it in oil before pressing fit if the bearing had been stored for a long time (put it into3 spindle oil free from water).And heat it to 110oC- 1200C, keep this temperature for 2 hours. The cool with the oil, thus getting better result.5.1.5 Keep it from dirt5.2 Preparations before starting 5.1.1 Check if the mounting is correct and stable, reliable in every joint, and the handles & movable parts are flexible & reliable.5.2.2 Check if the oil levels in diesel engine & gearshift case are reached to the mark of dip stick, and if the oil tank is full and all the parts that need lubrication are lubricated (see the table below).5.2.3 Check if the braking handle of the hoist is flexible, and the tightness of brake belt is proper in ON & OFF positions. The surfaccs of belt drum & support should be free from oil so as to avoid slipping.5.2.4 Set the handle of the friction clutch in OFF position and the shifting handle in the Ist position , and set handle 12 of the grearshift to get contact with spindle . Turn the spindle with hand to check if the rotating parts are flexible and get rid of, if there is any unusual noise.5.2.5 Adjust the gate valve of water pump and the branch tap. To the proper positions. It is forbidden to turn off these two taps at the same time so at to avoid damaging some parts of the pump. The suctionhose shouldn’t be longer than 6m and the suction lift no more than 3m. The back valve should not be too close to the bottom of the pond. 5.2.6 Fill clean water into the pump & suction hose.5.2.7 Set handle of the gearshift in “Spindle” position. The clutch handle of water pump in “OFF” position, the handle of direction control valve in “STOP” position and handle of surplus valve in the lowest pressure position. Then start diesel engine, after it is working normally. Start the drilling machine and water pump.5.3 Operation & maintenance during work time 5.3.1 The drilling rig is not allowed to work without operator(s).5.3.2 Before pulling the handle of gearshift or that of hoist, the clutch should be off and the gears are stop running first so as to avoid damaging the gear. Handles must be set into the location hole.5.3.3 Before shutting the spindle case, the clutch should be off and the driving cone gvear stop running first. Before staring the spindle, the case bolts must be screwed down. 5.3.4 Before drilling, the string should be lifted from the hole bottom. Then set the clutch on until it works properly and then start drilling.
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