Terex Optima TC User manual

Tech-Tip 80 Rev. B 1 Released: 7/11/2019
Tech Tips
Service Call:
Optima TC Boom Comp Adjustment
Tools Required:
Open End Wrench - 3/8”, 7/16”, 1/2”,
5/8”, 3/4”
3/8” Socket Drive Set
Allen Wrench - 3/32”
Model(s):
Optima TC with Compensation

Tech-Tip 80 Rev. B 2 Released: 7/11/2019
Tech Tips
Tech Tip Safety Rules
Danger
Failure to obey the instructions and safety rules in the appropriate
Operator's Manual and Service Manual for your machine will result in
death or serious injury. Many of the hazards identified in the operator’s
manual are also safety hazards when maintenance and repair
procedures are performed.
Do Not Perform Maintenance Unless:
•You are trained and qualified to perform maintenance on this
machine.
•You read, understand and obey:
omanufacturer’s instructions and safety rules
oemployer’s safety rules and worksite regulations
oapplicable governmental regulations
•You have the appropriate tools, lifting equipment and a suitable
workshop.
The information contained in this tech tip is a supplement to the service
manual. Consult the appropriate service manual of your machine for
safety rules and hazards.

Tech-Tip 80 Rev. B 3 Released: 7/11/2019
Tech Tips
Step 1
This adjustment is made to keep the upper
boom at or just above horizontal when the lower
boom is operated up or down.
This adjustment works best with two technicians
when adjusting the compensation. One person
operates the unit from the platform while the
second person observes the boom orientation
and adjusts the compensation. One person can
do it, but it requires climbing in and out of the
platform multiple times until the adjustment is
correct.
Step 2
Disconnect the boom overload light and remove
the lower control valve cover.

Tech-Tip 80 Rev. B 4 Released: 7/11/2019
Tech Tips
Step 3
Loosen the jam nut and adjust the pressure
compensators on the upper and lower boom
sections so that two (2) threads are showing on
the adjustment plug. Tighten the jam nut
adjustment.

Tech-Tip 80 Rev. B 5 Released: 7/11/2019
Tech Tips
Step 4
Loosen the upper boom pilot fitting and rotate it
slightly to gain access to the handle travel
adjustment. Be careful not to interfere with the
lower boom control handle travel. Retighten the
fitting.
Escaping fluid under pressure can penetrate skin causing
serious injury.
Relieve pressure before disconnecting hydraulic lines. Keep
away from leaks and pin holes. Use a piece of cardboard or
paper to search for leaks. Do not use your hand.
Step 5
Loosen the jam nut on the upper boom section
and back it off until two threads are showing on
the set screw. Screw in until the jam nut makes
contact with the valve and tighten the jam nut.