PB_560

Title:
Impel/Velocity™ Step Replacement
Number:
PB_560
Release Date:
02/11/2022
Revision Number:
1
Revision Date:
11/23/2022
Chassis Type:
Impel/Velocity™
Component
Description:
Cab step options for discontinued step module
Reference PSB0645 Impel/Velocity Power Steps
Warranty:
N/A
Parts:
See below
Tools:
Typical shop tools
Subject:
Replacement step options for discontinued power steps on Impel/Velocity™ chassis.
Purpose:
Required electrical component used to control the electrical steps has been discontinued by the manufacturer.
The electric power step replacement/repair options available are as follows:
Option 1: Replace, rewire and weatherproof discontinued module (p/n 63-4750-0001)
This option is available if the module is the only part to be replaced.
The following parts are no longer available:
o
Part Number
o
Item Description
o
1768395
o
STEP,UPPER
o
1768402
o
STEP,LOWER
o
1768406
o
CROSS LINK,LOWER
o
1768408
o
LINK,LONG
o
1768409
o
LINK,SHORT
o
1800056
o
CROSS LINK,UPPER
o
1800057
o
BRKT,UPPER ACTUATOR MOUNT
o
1801040
o
BRKT,SPRING PLUNGER MOUNT,LH
o
1801041
o
BRKT,SPRING PLUNGER MOUNT,RH
o
1776622*
o
ACTUATOR,ELECTRIC,POWER STEP
*Limited availability. Once current stocks are exhausted as of the time of this
bulletin, then it will no longer be available.
If any of these need to be replaced, then option 1 is not available.
Option 2: Replace with existing fixed option 0555486 Steps, 4-Door Cab, Dual, Imp/Vel
Option 3: Replace with new air steps option 0799676 Steps, 4-Door Cab, Automatic, Air, Imp/Vel
Description:
Option 1: Replace, rewire and weatherproof module (p/n 63-4750-0001)


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Order parts:
o 4076068 MODULE,STEP ASSEMBLY 12AMP 8-18VDC
o 64-2343 RELAY,SPDT 30A 12VDC,ENCAPSUL W/RESISTOR W/TAB
o 64-2344 HARNESS,ENCAPSULATED RELAY
Request wiring diagram 66-8000-354S
Replacement module is not a direct replacement.
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PARTS BULLETIN #560
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New unit is not waterproof and is intended for indoor use. Module must be mounted and wired in
a weather-tight location. Unit is 4.125”L x 2.375”W x 1.00”H (H is to top of terminals).
Operating temperature range is -40°C (-40°F) to +85°C (+185°F).
Module receives a positive signal rather than a negative, so wiring modifications will be required.
Option 2: Replace with existing fixed option 0555486 Steps, 4-Door Cab, Dual, Imp/Vel

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Order one each of bill of material:
o 1961803 - 0855-LOWER STEPS, FRT CAB
o 1961969 - 0855-LOWER STEPS, RR CAB
o 3542952 - 0855-CAB, DUAL STEP, LT (Standard step lighting)
Request reference 3542952 REF,LOWER STEPS,DUAL
NOTE: If job is a two or three door cab, please submit an NPN request on Pierceparts.com
Option 2 Dual fixed steps
Option 3: Replace power cab step system with new air step
system option 0799676 Steps, 4-Door Cab, Automatic, Air,
Imp/Vel
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
Order one each of bill of materials:
o 3449946 - 0855-LOWER STEP
o 3449019 - 0855-CAB STEP ELECTRICAL
o 2993459 - 0855-AIR SYSTEM, LOWER STEP
Request wiring diagram 66-8000-354B
Option 3 Automatic air step extended
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PARTS BULLETIN #560
Option 3 Automatic air steps retracted
If any additional support is needed, please open a technical support incident on Pierceparts.com.
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