TROUBLESHOOTING 2250 SERVICE/MAINTENANCE MANUAL
10-48
Published 11-06-15, Control # 040-13
Test 14 — Adjusting the Control Handle Potentiometer
An unusual reaction to a control handle movement may
indicate a misalignment or handle 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.
• Retighten 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.
• Retighten slotted set screw.
Double axis control handle adjustment is the same, except
the 2 socket set screws (item 7) on gear collar are loosened.
Item Description Item Description
1
2
3
4
Neutral (snap) switch
Jumper connection (N/O)
Ground terminal “R”
Slotted set screw
5
6
7
Center Terminal “C”
Potentiometer
Socket set screw (2)
6
P1525
P1526
543
1
2
7
3
5
Double Axis
Controller
Single Axis
Controller
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