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Mount fixtures
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Adjust the position of a J3-style crosshead
Operation of controls
The crosshead lift and lock cylinders are operated by controls on the front of the frame base. The controls
consist of a lifts control switch and locks control switch:
• Lifts control switch - This switch controls the operation of the crosshead lift cylinders. The crosshead
must be unclamped before the crosshead can be adjusted. This switch is spring operated and will
return to the neutral center position when released.
• Locks control switch - This switch controls the operation of the crosshead lock cylinders. This switch
must be placed in the Lock position for testing. Only place it in the Unlock position when the
crosshead is to be adjusted.
Improper use of the crosshead lift cylinders can cause damage to the frame or installed
accessories! Do not position the crosshead at either extreme of the lift cylinders (fully
extended or fully retracted) unless specifically directed to do so by procedures in this
manual. This can cause the crosshead to become unlevel and result in the following
conditions:
• Any fixture or specimen installed in the frame may not align.
• If the crosshead is positioned with the crosshead lift cylinders fully extended and a tension or
compression load is applied, the crosshead could slip until it reaches a level position.
• If the crosshead is positioned with the crosshead lift cylinders fully retracted and a tension load
is applied, the crosshead will not be able to absorb the shock generated by a specimen break.
This will cause the shock to be transferred to other components of the frame and may cause
damage to the frame.
Equipment required
• A suitable stable platform such as a man-lift, stairs, or ladder. The platform must be of sufficient
height so that the operator can reach the crosshead.
• A 5/16 in hex-bit socket (supplied)
Figure 9. Crosshead lift and lock controls.
Lifts Control Switch Locks Control Switch
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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