Operation
MTS Landmark™ Tabletop Load Units - Product Information 71
4. Torque the crosshead bolts to the value in Step 4.
Note: Use the same sequence when you loosen the bolts.
Crosshead Clamping Bolt Torque Values
The following table includes values for crosshead clamping bolt torques for each step in the manual
clamping procedure.
Load Unit Step 1 Step 2 Step 3 Step 4
1
370.02 20 N·m (15 lbf·ft) 171 N·m (126 lbf·ft) 190 N·m (140 lbf·ft) 190 N·m (140 lbf·ft)
370.10 20 N·m (15 lbf·ft) 171 N·m (126 lbf·ft) 190 N·m (140 lbf·ft) 190 N·m (140 lbf·ft)
370.25 20 N·m (15 lbf·ft) 244 N·m (180 lbf·ft) 271 N·m (200 lbf·ft) 271 N·m (200 lbf·ft)
Torque Values
1
This step ensures uniform tightness
Move the Crosshead Hydraulically
This procedure describes how to position a crosshead for a Series 370 Load Unit equipped with
hydraulic crosshead lifts.
1. Pressurize the lift actuators. The crosshead may have shifted position while hydraulic
pressure was turned off.
Briefly turn the Crosshead Lift Control to the lift crosshead position to apply a slight upward
pressure to the crosshead.
Then return the lift control to the stop position "O."
2. Unclamp the crosshead. Loosen the four bolts that clamp the crosshead to the columns.
3. Use the Crosshead Lift Control to move the crosshead to a point where you can install the
specimen (or specimen fixture) into the upper grip or fixture without obstruction.
Set the control to the stop position "O" before proceeding.
Note: Always lower the crosshead to where you want it. The pressure remaining in the
lift cylinders after raising the crosshead can slightly shift its alignment. Lowering the
crosshead to its final position removes this pressure and improves alignment.
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