Manitowoc 999 Service And Maintenance Manual

Reference Only
TROUBLESHOOTING 999 SERVICE/MAINTENANCE MANUAL
10-40
Published 05-16-17, Control # 233-03
Test 8 – Adjusting the Control Handle Potentiometer
An unusual reaction to a control handle movement may
indicate a handle misalignment to potentiometer. Adjusting a
single axis or double axis control handle requires aligning the
handle and potentiometer in the neutral position. Neutral is
the position where 5 volts DC is present.
To check single axis controller:
• Engine must be off and power on, with all brakes and
locks engaged.
• Connect a jumper wire between the normally open
terminal on the neutral switch and terminal “C” on the
handle terminal block.
• Connect the positive lead of a digital multi-meter to
terminal “C”.
• Connect the negative lead on a grounded crane
component or on terminal “R”.
• Loosen the slotted set screw (item 4) and allow handle
to return to neutral position.
• Re-tighten slotted set screw and move handle until a
reading of 5 volts DC is obtained.
• Holding the handle in the 5-volt position, loosen the
slotted set screw (item 4).
• Allow handle to return to neutral position.
• Re-tighten slotted set screw.
The double axis control handle adjustment is the same,
except the 2 socket set screws (item 7) on the gear collar are
loosened.
Item
Description
Item
Description
1 Neutral (snap) Switch 5 Center Terminal “C”
2 Jumper Connection (N/O) 6 Potentiometer
3 Ground Terminal “R” 7 Socket Set Screw
4 Slotted Set Screw
6
P1525
P1526
5
4
3
1
2
7
3
5
Double Axis
Controller
Single Axis
Controller

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English