Scheduled Maintenance M14-13655-EN
7-2
Scheduled Maintenance
Maintenance Timeframe
The maintenance required on the Model 8250 varies with the frequency and type of
testing.
Perform a complete check of the machine after the first 10 tests performed on the
machine. After that initial check, make a complete check every week for the next 3-4
weeks. Continue to perform complete safety checks regularly every three months for as
long as your machine is in regular use.
Always service the machine prior to operation after an extended idle period.
Consult with Instron Dynatup if you have any questions or are confronted with a situation
not addressed in this manual.
Regular Maintenance Steps
The following checks and procedures should be performed during regular maintenance.
• Clean the glass safety enclosure with a soft cloth and mild detergent or window
cleaner.
• Clean the guide columns with thinner and, if necessary, fine steel wool. Apply a very
thin coat of light machine oil or silicon lubricant to the columns after cleaning. Do
not use a heavy oil or grease. Do not apply solvent to the crosshead bushings and be
sure to remove any steel wool fragments when finished.
• Occasionally lubricate the latch-pin roller bearings on the crosshead and the hook pin
with light machine oil. Apply a drop of oil to each bearing. Refer to Figure 7-1 for
an illustration of lubrication points.
• Check the condition of the hoist cable by raising and lowering the latch assembly.
Note any wear and replace if necessary. Be sure to:
• Verify that the cable is wrapping uniformly around the hoist hub. To view the
hub, remove the small cover plate surrounding the cable on top of the rear motor
enclosure.
• Check the alignment of the pinch roller that presses on the hoist hub. The nylon
roller should be pressing uniformly and with moderate force against the hub. If
the pinch roller is not aligned, readjust the clamp mounting screws. Also, if the
pinch roller makes a grinding noise when hoist is in operation, apply a coat of
light machine oil.
• Check that the crosshead slides freely over the length of the guide columns. If there
is any resistance to full crosshead movement, visually examine the crosshead for
damage. Next, install the stop block stacks and drop the crosshead from a few inches
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