TM 5-3810-307-24-1-1
HOIST DRUM ROTATION INDICATOR
DESCRIPTION
The hoist drum rotation indictor is an electrically
the hoist motor to sense rotation of the motor shaft
operated system (one for each hoist) that provides
and thus indirectly the hoist drum. The sensor is
the operator with a touch indication of drum rotation
connected by electrical wiring to the controller unit
so he will know if and at what speed the drum is
that acts as a pulse generator and sends a pulsating
rotating, even under the most distracting conditions.
signal (proportional to rotation speed) to the indicator
unit. The indicator unit is located in the control lever
The indictor assembly consists of three main parts -
handle and pulsates in time with the signal from the
the magnetic sensor, the controller unit, and the
controller unit.
indicator unit. The magnetic sensor is installed in
MAINTENANCE
and do not require periodic maintenance. If a
GENERAL
malfunction occurs, repairs should be limited to the
WARNING
electrical harness and replacing a faulty unit. To
determine which unit is at fault, interchange known
Disconnect
the
batteries
before
good units from other hoist drum rotation indicator
performing any maintenance on this
systems, if available. Hook them in, one at a time,
system. Serious burns may result from
and operate the affected hoist. By a process of
accidental shorting or grounding of live
elimination, the faulty unit can be easily detected. If
circuits.
difficulty persists, contact Grove Product Support,
Box 21, Shady Grove, Pennsylvania 17256.
The sensor, controller, and indicator units are sealed
Figure 2-11-5. Rotation Indicator Unit
