49
Frame
Product Support: www.instron.com
covers” on page 46). After several years of use, it is normal to see some weeping or seeping of oil
from the hydraulic cylinder. This small amount of oil can be cleaned and normal operation of the
frame can continue. Excessive leakage that results in pooling of oil over a short period of time is
abnormal; contact your local Instron Services department as directed on page 17 for immediate
assistance.
• Clean the rod of the hydraulic cylinder. Completely extend the hydraulic cylinder and wipe the rod
with a soft cotton cloth to remove oil residue and debris.
Crosshead
The crosshead requires maintenance depending on the style of crosshead supplied with your frame.
Refer to the following sections as appropriate.
Check operation of lift and lock cylinders of J3-style crosshead
Frames that are equipped with a J3-style crosshead should have operation of the crosshead lift and
crosshead lock cylinders checked at the frequency stated in the “Preventative maintenance
schedule” on page 43. To check operation:
Equipment required
• A 5/16 in hex-bit socket (supplied)
• A torque wrench (supplied)
• A ratchet wrench with 3/8 in square-drive
Recommended procedure
1. Start the system; see page 30. Start the HPS.
2. Unclamp and clamp the crosshead lock cylinders. They should operate smoothly and quickly with no
unusual noise. The Interlock status in the controlling software should indicate Normal when the
crosshead is clamped.
3. Loosen the crosshead support collars so that they can slide along the columns (use hex-bit socket
and ratchet wrench). Allow them to rest on the frame table.
4. Unclamp the crosshead lock cylinders and operate the crosshead lift cylinders to move the crosshead
through its full range of motion. It should move smoothly with no unusual noise or erratic motion.
5. Return the crosshead to the desired operating position.
6. Clamp the crosshead lock cylinders.
7. Adjust the crosshead support collars on the columns so that they are in contact with the bottom of
the crosshead (use hex-bit socket and ratchet wrench). Secure the crosshead support collars to the
columns. Tighten the cap screws to a torque of 68 N-m (50 lbf-ft) (use hex-bit socket and torque
wrench).
Before checking operation of the crosshead lift and lock cylinders, you must be familiar with operation of
the lift and lock cylinders. Refer to “Adjust the position of a J3-style crosshead” on page 37.
All equipment must be supplied by the customer unless noted as “supplied”. For a list of equipment that
was supplied with the system, refer to “Ancillary parts” on page 57.
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