Chapter 4: Maintenance
76 M47-17027-EN
• Check for excessively shiny or worn surfaces (blackening is worn off of surface). This could
indicate a poor fit or presence of debris. Investigate the cause of the wear and correct any
problems. Some wear is expected with normal use.
• Check for gouged surfaces. This could indicate that there is or has been debris between
surfaces and that the interval for cleaning should be more frequent, see Footnote 1 of
Table 14 on page 61. This could also indicate that the grip dust covers (11, Figure 17) are
not installed correctly. (Continued use with debris between surfaces may cause binding of
the jaw carriers and lead to further damage or wear. If gouge is not severe, the area can be
filed smooth. If gouge can not be smoothed, the jaw carriers should be replaced.
• Check for bent or broken front and rear guide pins (5, Figure 17). Bent or broken pins
indicate misuse; check for proper specimen engagement and proper jaw face sizing for the
specimen being tested. If damage is not severe, a pin can be straightened. If straightening
is not possible or if a pin is broken, the pin should be replaced.
• Check for sharp edges or deformed corners that could inhibit motion of the jaw carriers or
cause damage to wear plates. If damage is not severe, the edges and corners can be filed
smooth. If damage can not be repaired, the jaw carriers should be replaced.
• It is highly recommended that the wear plates are replaced anytime the jaw carriers are
replaced (see step 5).
7. Clean and inspect grip pockets:
a. Clean all dirt, debris and lubricant from each grip pocket.
b. Inspect each grip pocket for damage. For frames with G1-style crossheads, use a flashlight to
illuminate the surfaces of the grip pocket. Check for signs of wear, galling, scoring or other
damage. Light scoring should be smoothed with a file or pneumatic sander. If deformation of
the pocket or severe scoring is noticed, contact your local Instron Services department as
directed on page 20. It may be possible to correct problems by machining.
8. For frames with G1-style crossheads: Reassemble components:
a. Install grip stop plate to top of tension crosshead and bumper plate to bottom of adjustable
crosshead.
b. Reassemble and lubricate components according to the instructions outlined in “Install grip
jaws - G1-style crossheads” on page 46.
9. For frames with G7-style crossheads: Reassemble components:
a. Install jaw carriers into grip pocket. Place the groove in the bottom of the jaw carrier over the
edge of the push plate and slide jaw carrier into the grip pocket. Be sure that the guide pin in the
rear of the jaw carrier enters the slot in the rear guide plate.
b. Install a wear plate between each jaw carrier and the side of the grip pocket. Be sure to orient
the wear plates properly as shown in Figure 17.
c. Clean the threads of the guide plate cap screws (removed in step 4) with Loctite
®
ODC-FREE
Cleaner and Degreaser 7070.
d. Apply a small amount of Loctite 246
®
Threadlocker High Temperature/Medium Strength to the
threads of the cap screws.
e. Install guide plates to front of each crosshead and secure in place with the prepared cap screws.
Torque each cap screw to the torque listed in Table 12 on page 51 for your model.
f. Lubricate the grip assemblies as outlined in “Lubricate the grip assemblies” on page 72.
10. The grip assemblies are now ready for normal operation.
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