Terex TM Series Bedienungsanleitung

Tech-Tip 57 1 Released: 1/9/2019

Tech Tips

Service Call:

How to use the Manual Letdown on the

TM series

Tools Required:

7/8’’ wrench (supplied with unit)

Jack handle (supplied with unit)

Model(s):

TM85, TM100, TM105, and TM125

Tech-Tip 57 2 Released: 1/9/2019

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 57 3 Released: 1/9/2019

Tech Tips

Step 1

Assess the boom position and identify any

obstructions. Remember when using the manual

letdown, the lowering of the upper boom, lower

boom, and the lower boom extension are all

done by gravity alone. None of the interlock

systems will operate. The platform will not level

as the booms are lowered. Plan the movements

required to get the platform to the ground before

using the manual letdown system.

The unit can be rotated using a hex fitting on top

of the rotation motor.

The manual letdown will not extend or retract the

upper boom or the Jacks.

Only use one function at a time when using the

manual letdown system.

Once the manual letdown system has been

activated, all four of the letdown controls must

be returned to neutral to stop the motion of the

boom.

The platform will not level when using the manual letdown.

Tech-Tip 57 4 Released: 1/9/2019

Tech Tips

Step 2

When the manual letdown is used, none of the

safety limit systems are operational. Unless the

unit needs to be rotated to clear obstacles,

proceed to Step 3 to retract the lower boom.

If the platform or the boom is near any obstacles

and needs to be rotated away before lowering

the unit, rotate it by turning the far right knob to 3

o’clock.

The safety limit systems are not operational when using the

manual letdown.

Tech-Tip 57 5 Released: 1/9/2019

Tech Tips

Using the jack handle, pump up the handle until

it gets hard, (you may need to keep pumping the

jack intermittently to keep brake released).

Push the counterbalance override on the brake

valve and use the 7/8” wrench to rotate the unit.

Tech-Tip 57 6 Released: 1/9/2019

Tech Tips

Rotation will be stopped when the manual

override button is released. Turning the knob

back to its original position will also stop rotation.

If the brake valve does not have the manual

override button, a lot of force is needed to rotate.

You can turn the counterbalance valves in

clockwise to decrease the pressure and allow

manual rotation.

The counterbalance valves must be reset before the unit is

returned to service.

Tech-Tip 57 7 Released: 1/9/2019

Tech Tips

Step 3

To activate the lower boom extension letdown,

pull the first knob on the left side and then turn

to lock it in position. Pump the handle until the

boom starts to come down. Always retract the

lower boom extension fully before lowering the

lower boom.

The lower boom extension will retract quicker by

moving the handle of the lower boom extension

valve, allowing oil to go back to tank faster.

Tech-Tip 57 8 Released: 1/9/2019

Tech Tips

To stop the boom simply pull the manual

letdown knob and turn back to the normal

position. This will close the pilot valve stopping

the movement.

Step 4

Depending on what position the upper and lower

booms are in will determine which boom must

be lowered next. Remember that the booms

come down with GRAVITY only and none of the

limit systems will work. This includes the over-

center limit system. Do not allow the platform to

go past the vertical center of rotation at any

time.

The safety limit systems are not operational when using the

manual letdown.

Do not allow the platform to go past the vertical center of

rotation at any time.

Tech-Tip 57 9 Released: 1/9/2019

Tech Tips

Step 5

To activate the upper boom letdown, pull the

second knob from the left and lock it in the out

position. When movement stops push it back in

and pump the jack up again. Next pull the third

knob from the left (lower boom) until movement

stops. Keep repeating as necessary between

the upper boom and lower boom functions. Only

operate one function at a time.

The safety limit systems are not operational when using the

manual letdown.

Do not allow the platform to go past the vertical center of

rotation at any time.

The platform will not level when using the manual letdown.

Only manually operate one function at a time.

Tech-Tip 57 10 Released: 1/9/2019

Tech Tips

Step 6

If the position of the upper and lower booms

allows the lower boom to be lowered, first lower

the lower boom making sure that the platform

does not go past center of rotation. Then lower

the upper boom. It may be necessary to keep

pumping the manual letdown jack to maintain

pressure to the pilot valves.

The lower boom extension must be fully retracted before

lowering the lower boom.

Lowering both booms individually back and forth

will help prevent the platform from completely

dumping upside down. If the upper boom is

lowered first the platform could be completely

upside down depending on the angle of the

boom starting position.

The safety limit systems are not operational when using the

manual letdown.

Do not allow the platform to go past the vertical center of

rotation at any time.

The platform will not level when using the manual letdown.

Only manually operate one function at a time.

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