www.energyabsorption.com
Revision B December 2013
www.highwayguardrail.com
20
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Repair Instructions
The following instructions are given by first presenting a problem and then giving a possible
solution.
I. Cartridge cannot be elevated
Consult hydraulic schematic in this manual. Clogged filters or improperly adjusted “internal
pump relief valve” could be the problem. There may not be enough hydraulic fluid in the
pump reservoir. Use only Dexron
®
III fluid. Use care not to cross-thread cap during repair.
II. Cartridge will not bleed down
A.
Refer to I. above. The flow control valve for adjusting the bleed-down rate may be too
tight or clogged with dirt.
B.
Make sure hydraulic Latch Pins are clearing the holes in the Backup.
III. Latch Pin does not work properly
A.
Check for areas where it might be binding and correct the problem.
B.
Add grease to the sliding parts.
C.
Check to make sure there is enough fluid in the reservoir. Refer to step I. above.
D.
Align the Latch Pin holes in the Backup (when in the full up position) by unscrewing the
large cylinder’s clevis up to two revolutions.
IV. Lights will not work
A.
Replace affected light bulb(s).
B.
Check wire(s) for damage.
C.
Using a volt/ohmmeter, troubleshoot and locate the problem.
V. Cartridge is not level
A.
Check for cause of problem
1. Temporary extra load in truck.
2. Support Frame improperly assembled.
3. Weakening truck springs.
B.
Adjust Cartridge
1. Shims can be added or subtracted under the Lower Truck Brackets to adjust the
levelness of the Cartridge. Each 13 mm [1/2”] thick shim will raise or lower the rear
end of the Cartridge approximately 50 mm [2”]. 6 mm [1/4”] thick shims are also
supplied. Additional adjustment can be achieved by using the alternate holes in the
lower leg of the Support Frame. Height is adjusted up or down by using the upper
attachment holes in the Support Frame. The correct final position of the Cartridge is
305 mm ±25 mm [12” ± 1”] above the ground at all points.
VI.
Alpha 70K Cartridge has been damaged
The following is a general description of various types of damage that can occur to Alpha
70K TMA Cartridges. Please review and heed the following recommendations to achieve
intended impact performance (see Figure 9 on page 22).
