Chapter 4: Maintenance
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M47-17035-EN
a short period of time is abnormal; contact your local Instron Services department as directed on
page
for immediate assistance.
•
Clean the rod of the hydraulic cylinder. Completely extend the hydraulic cylinder and wipe the rod
with a soft cotton cloth to remove oil residue and debris.
Crosshead
The crosshead requires maintenance depending on the style of crosshead supplied with your frame.
Refer to the following sections as appropriate.
Maintain the tensioners of J1-style crosshead
Frames that are equipped with a J1-style crosshead use Superbolt tensioners to secure the crosshead to
the columns. These tensioners should be maintained at the frequency stated in the
. Perform the following procedure to check and maintain ALL
tensioners on the crosshead:
1. Perform steps
of
“Adjust the position of a J1-style crosshead”
.
2. Remove all tensioners on the crosshead.
3. Clean and inspect each jackbolt for damage, especially inspect the tips for deformation. If damage or
deformation is noticed, replace the jackbolt. Only Superbolt jackbolts should be used; do not use
commercially available screws because they are not suitable for such high loads - contact your local
Instron Services department as directed on page
for replacement parts.
4. Inspect the hardened washer for damage or deformation. Depressions in the washer surface of
0.025 to 0.050 mm (0.001 to 0.002 in) are normal. If depressions are noticed, the washer can be
re-used by turning over. If washer has already been turned over once, replace the washer. Only
Superbolt hardened washers should be used - contact your local Instron Services department as
directed on page
for replacement parts.
5. Lubricate each jackbolt with high pressure lubricant.
6. Install jackbolts in tensioners. Make sure jackbolt tips are flush (or recessed) with bottom of
tensioner.
7. Place hardened washers onto main studs; one washer per stud.
8. Lubricate thread of main studs and washer face with high pressure lubricant.
9. Thread tensioners onto studs.
10. Perform steps
through
“Adjust the position of a J1-style crosshead”
Check operation of lift and lock cylinders of J3-style crosshead
Frames that are equipped with a J3-style crosshead should have operation of the crosshead lift and
crosshead lock cylinders checked at the frequency stated in the
. To check operation:
Before checking operation of the crosshead lift and lock cylinders, you must be familiar with operation of
the lift and lock cylinders. Refer to
