KONE Maintenance Method
MX10 / MX20 MCP Procedures - ASME A17.1-2013 / CSA B44-13
© 2014 KONE Corporation PSK8-604-MX10/MX20
All rights reserved.
65 (-) 2014-12-15
4.1 CATEGORY 1 TRACTION ELEVATOR TEST PROCEDURE
8.6.4.19.1: OIL BUFFERS
Category 1 inspection of oil buffers
• Check to ensure that the hardware holding buffers is in place and is tight.
• Check oil level in buffer to ensure it is within the minimum and maximum limits.
If the oil is too high or too low, correct to the proper level.
Check to ensure that the plunger is clean, rust-free, and does NOT have excessive side play.
Category 1 testing of oil buffers
Test spring return and gravity return type oil buffers by fully compressing the plunger. Release
the plunger and make sure it returns to a fully extended position within 90 seconds.
To compress a buffer, place a suitable piece of 4x4 wood block beneath the car or
counter weight and buffer, then run car or counterweight down at inspection speed.
Record the completion of the annual oil buffer test on a KONE annual test tag. This tag must be
attached to the buffer with wire. Also record all work completed on a Safety Test Form.
8.6.4.19.2: SAFETIES
Category 1 inspection of safeties
Check the car and counterweight guide shoes and their fasteners to make certain they are properly
secured, aligned, and adjusted. Check slide guides or rollers for excessive wear.
Check the clearance between the guide rail and each safety-gripping face.
• The clearance between the safety’s rail-gripping faces must not be less than the thickness of the
guide rail plus 9/64 inch there must be a minimum of 1/16
inch between either side of the rail
and the rail-gripping face.
Check the crosshead pivot points and linkage for lost motion, loose or missing set screws, and
excessive friction. Also check the adjustment of the finger rods and rollers.
If there is any lost motion in the actuation lever, adjust to eliminate that lost motion. Lost
motion and inertia of the governor-rope system may cause the safety to apply unnecessarily
under normal starting conditions.
With the elevator car platform located at a convenient height, check the safety mechanism from the
pit. The following conditions must be present.
• Rollers must be in place.
•
Finger rods must be in a position to pick up the rollers.
• When the governor rope is pulled to move the finger rods, the roller must move upward freely
into the highest wedged positions in the safety block.
Warning: A safety can fail if there is a jam between the roller and safety block. Check the
roller operation several times to make sure that the rollers fall toward the guide rail. When
the finger engages the roller, there should not be any tendency for the roller to fall away from
the guide.
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