MTS Series 322 Load Frames - Manual (Page 58)

Series 322 Load Unit 58 Operation
Load Unit: Position the Crosshead Manually
This procedure describes how to position a crosshead for a load unit with no
hydraulic crosshead lifts or locks.
The crosshead is very heavy.
A dropping crosshead can crush hands, damage grips, and smash
specimens.
Observe the following precautions to reduce the possibility of unexpected
crosshead movement:
• Ensure that the crosshead is locked.
• The overhead crane and lifting chains must be able to support the weight of
the crosshead (see the Crosshead Weight table below).
• Center the crane directly over the load unit.
• Remove any slack in the lifting chains before unlocking the crosshead.
• Completely loosen all crosshead locking bolts before attempting to move the
crosshead.
• Keep the columns clean and dry. The crosshead cannot be securely clamped
to greasy or damp columns.
The following procedure describes using an overhead crane to position the
crosshead. You can use any device that can lift the weight of the load unit.
1. Center the overhead crane directly over the load unit.
2. Attach the lifting chains to the lifting rings. Remove any slack in the lifting
chains while keeping chain tension to a minimum.
3. Remove the covers on the ends of the crosshead. The crosshead covers must
be removed to access the manual locking bolts and to clean and lubricate the
bolts. Six 1/4-20 screws (three top, three bottom) on each cover need 5/32
hex (not included). Hand-tighten when reinstalling the covers.
Frame Rating 100 kN (22 kip) 250 kN (55 kip) 500 kN (110 kip)
Crosshead Weight 57 kg (125 lb) 102 kg (225 lb) 193 kg (425 lb)
WARNING