MTS Series 647 Hydraulic Wedge Grips - Manual (Page 94)

Hydraulic Hoses and Fittings
Check the hydraulic hoses and fittings monthly. Ensure that hoses are routed properly and not wearing. Also
ensure fittings are not leaking.
Wedges
After approximately 100 lock and release cycles, remove the wedges from the hydraulic wedge grips and
apply an anti-seizing compound to the edges of the wedge which contact the wedge chamber and grip piston.
1. Remove the wedges from the grip chamber.
2. Apply a thin layer of lubricant to the edges of the wedge which contact the wedge chamber and grip piston;
see the “Temperature ranges” for the recommended lubricant.
The edges of the wedge which contact the chamber and piston and the cap screws securing the specimen
guides on the wedges should be lubricated after approximately 25 hours of operation or after the test.
3. For Model 647.250 Grips, also apply a thin layer of lubricant to the bracket surface that contacts the spring
block.
4. Repeat Steps 1 and 2 (and 3, if applicable) for the other grip.
5. Replace each wedge into the grip.
Water Cooling Components
If the grips are used in an elevated temperature environment, check the water cooling tubing and fittings
weekly. Ensure that tubing is routed properly and not wearing. Also ensure fittings are not leaking.
Daily Inspections
Ensure that hoses are routed properly, not wearing, and the fittings are not leaking. Hoses must be routed
as to avoid direct heat sources, moving or abrasive equipment.
94 Series 647 Hydraulic Wedge Grips Reference Manual
Maintenance