TM SERIES
1 - 4 8
4 7 2 7 9 7 - 1 / 1 5
T e r e x S o u t h D a k o t a , I n c .
T M S e r i e s
OPER
A
T
ION
GUIDEL
INES
AUXILIARY LET DOWN POWER (OPTIONAL)
The auxiliary let down power system provides power from a DC motor-pump for operation of the Aerial
Device in case of a prime power source failure. Controls for auxiliary let down power may be located at the
platform, pedestal (optional), and outriggers (optional).
At the platform, the auxiliary let down power is operated by a fiber optic switch, located with the upper
controls. To activate this system, push and hold the “Auxiliary Power” push button then operate the controls.
The pump will engage after a 10 seconds delay. To turn “off” the power, release the “Auxiliary Power” push
button. The Auxiliary Let Down Power system should not be continuously operated longer than 30 seconds.
Continuous use will drain the battery and damage (overheat) the motor.
At the pedestal and the outrigger controls (if equipped), the auxiliary let down power is operated by a push
button switch. To activate this system, push and hold the switch, the pump will engage after a 10 seconds
delay. To turn “off” the power, release the switch. The Auxiliary Let Down Power system should not be
continuously operated any longer than 30 seconds. Continuous use will drain the battery and damage
(overheat) the motor.
Do not use the let down pump as an auxiliary pump. Use the let down pump only to lower the booms and/or
raise the outriggers when either the main pump or engine malfunctions. Using the pump to raise the booms
may cause damage to the let down pump motor.
When the Aerial Device is equipped with engine two-speed throttle and auxiliary let down power, the same
control is used for both. When the engine is running, the engine two-speed throttle operates. When the
engine is off, the auxiliary let down power operates.
MANUAL LET DOWN SYSTEM
If all power is lost, use the Manual Let Down System, (see operation instructions) to lower the platform using
gravity. The aerial device may be lowered and the rotation system can be manually powered using a 7/8”
gear wrench to get the platform down. Each situation will vary, so the ground personnel must carefully think
through what actions are required to lower the platform. Once a function is lowered, it cannot go back up
without hydraulic power. After lowering the unit manually, cycle the unit to remove air from the hydraulic
system before operation from the platform.
MANUAL ROTATION
If all the hydraulic power sources become inoperable, the Aerial Device rotation system can be actuated
manually. Use a 7/8 in. hex socket, an extension, and a ratchet to rotate the input shaft on the gearbox.
Actuating the lower rotation control will reduce the effort required for the rotation.
No interlocks or boom limits function when using the Manual Let Down. Operator
must keep boom in operational limits by retracting lower boom before lowering
lower boom.
