HOISTS 16000 SERVICE/MAINTENANCE MANUAL
5-2
Published 05-09-17, Control # 014-28
SPEED SENSOR ADJUSTMENT
General
The hydraulic motors for the hoists (boom, mast, load) and
swing have a speed sensor. For those functions having more
than one motor, only one of the motors has a speed sensor.
Each speed sensor monitors rotational speed and direction
of the corresponding function’s motor. The sensor sends a
signal to a remote node controller that transmits the
information to the crane’s master controller. The master
controller uses the information to control the crane function.
Speed Sensor Replacement
When removing the speed sensor from a motor, be careful to
contain the hydraulic fluid that will drain from the motor. After
installing a new sensor, add clean hydraulic oil to the level of
the motor’s top case drain port before starting engine.
Speed Sensor Adjustment
The speed sensors are set at the factory and should not
need adjustment, unless replaced.
1. Bring corresponding function to a complete stop, land
suspended load if load drum is being serviced, and
PARK function.
2. Remove faulty sensor. Do not connect sensor cable to
crane wire harness until initial adjustment is made.
3. Loosen lock nut and carefully turn sensor in (clockwise)
by hand until it gently contacts speed ring inside motor.
4. Back sensor out 1 turn or more until notch is positioned
180° from motor shaft (facing outboard side of motor).
5. Connect sensor cable to crane wire harness.
6. Operate drum motor and check for a steady drum speed
(RPM) signal on corresponding drum’s diagnostic
screen in cab.
If necessary, turn sensor out slightly until drum speed
(RPM) is steady at low and high RPM.
7. Hold sensor in position and securely tighten lock nut.
MINIMUM BAIL LIMIT ADJUSTMENT
See Figure 5-3 for the following instructions.
The optional minimum bail limit assembly on Drum 1 (main
hoist) and Drum 2 (auxiliary hoist) — is a protective device
which limits how much wire rope can be spooled off either
drum.
The minimum bail limit automatically stops the
corresponding drum when there are 3 to 4 wraps of wire rope
remaining on the first layer. The drum can be operated in the
hoist direction when the minimum bail limit switch is
contacted.
Adjusting the minimum bail limit switch requires operating
the drum to spool wire rope off the drum.
WARNING
Burn Hazard!
Hot oil will drain from motor port when sensor is removed.
Wait for hydraulic oil to cool before removing sensor.
WARNING
Falling Load Hazard!
Do not operate drum with less than 3 or 4 full wraps of
wire rope remaining on drum. Doing so can cause wire
rope to be pulled out of drum and load to fall.
P2196
Typical Speed Sensor Location
FIGURE 5-2
Item Description
1 Speed Sensor
2Notch
3 Lock Nut
4Cable
5 Motor
4
1
5
2
3
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