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.

Tech-Tip 80 Rev. B 6 Released: 7/11/2019

Tech Tips

Step 6

Position the booms slightly out of the boom rest.

Using demand throttle or high throttle on a 2

speed system, operate the lower boom at full

speed through the full travel of the boom.

Step 7

Observe the position of the upper boom after

Step 6.

If the upper boom is below horizontal:

Slow the lower boom down by turning the

compensator adjustment counter-clockwise 1/2

of a turn.

Do not adjust the lower boom down more than

twice. If the lower boom has been slowed down

twice, then adjust the upper boom 1/2 of a turn

clockwise to speed up the upper boom.

Tech-Tip 80 Rev. B 7 Released: 7/11/2019

Tech Tips

If the upper boom is above horizontal:

Slow the upper boom down by turning the

compensator adjustment counter-clockwise 1/2

of a turn.

Do not adjust the upper boom speed down

more than twice. If the upper boom has been

slowed down twice, then adjust the lower boom

1/2 of a turn clockwise to speed up the lower

boom.

Note: The lower boom will speed up when past

vertical. If the upper boom isn't slightly above

horizontal at this point it will end below

horizontal when the lower boom is at full travel.

Be careful not to turn the compensators in too far to increase

boom speed. The unit can begin to demand more flow than

the pump is capable of and result in inconsistent boom

movement.

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.

Tech-Tip 80 Rev. B 8 Released: 7/11/2019

Tech Tips

Step 8

Position the unit with the lower boom fully

extended, the upper boom horizontal, and high

throttle (demand or two-speed) engaged.

Operate the lower boom at full speed through

the full travel of the boom until either boom is

just out of the boom rest.

Step 9

Observe the position of the upper boom after

Step 8.

If the upper boom is below horizontal:

Slow the upper boom down by turning the

handle travel limit screw clockwise 1/4 of a turn.

If the upper boom is above horizontal:

Speed the upper boom up by turning the handle

travel limit screw counter-clockwise ¼ of a turn.

Tech-Tip 80 Rev. B 9 Released: 7/11/2019

Tech Tips

Note: Adjust so when the lower boom gets to

the rest the upper boom is 1-2 feet out of the

rest. Adjust lower boom up first as lower boom

down will change.

Verify that the upper boom down works from the lower

controls before operating from the platform. The adjustment is

very sensitive and may prevent the boom from coming back

down after the adjustment is performed.

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 10

Perform Step 8 and 9 again as needed to check

boom position and adjust as necessary.

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