© 20201Copyright Newmar Corporation. All rights reserved. For the most up-to-date version of this content, and for more product-specific information, please refer to Newgle.
40
CHASSIS
HWH Hydraulic System Troubleshooting Tips
PROBLEM
This article provides troubleshooting tips for the
following components:
•
HWH hydraulic slideouts
•
HWH hydraulic generator slideouts
•
HWH hydraulic entrance steps
•
HWH hydraulic leveling jacks
If any, or all, of these HWH hydraulic components are
not functioning, follow the troubleshooting steps before
contacting Newmar or HWH.
SOLUTION
If the pump runs for an accumulative time of
approximately three minutes while operating the HWH
jacks, slideout(s), generator slideout, or the step, the
system will turn off and the pump will stop running. This
only applies to coaches equipped with an HWH step.
If for some reason the pump doesn’t run for any HWH
equipment, it might be necessary to reset the HWH
system. If this time lockout occurs, power for the HWH
control system must be removed before any system
components will function.
Coaches Equipped With HWH
Reset Switch
Current coaches equipped with an HWH step system also
have an HWH reset switch installed in the main control
panel, allowing the user to reset the HWH control board.
1. Press and hold the momentary contact switch for
approximately five seconds to reset the system.
When the panel lights are on, the tractor icon is backlit in
green.
The suspension dump switch is guarded to prevent
unintentional switch activation. This switch does not
have a diagnostic blink function when inactive.
IMPORTANT
!
When the suspension dump switch is pressed, three
responses are possible: a normal response, a slow
response, and an abnormal response.
Normal Response
The LED in the switch blinks while the suspension is
deflating or filling. When it is completely deflated, the
LED comes on steady and stays illuminated. In normal
operation, the suspension may dump or fill so quickly that
the blinking of the switch is barely noticeable. If operation
of the switch is not possible for any reason (vehicle is
moving faster than 5 mph, ignition is turned off, etc.), the
LED will stop blinking and turn off.
Source:
Freightliner Business Class M2 Driver Manual (with added Note from Newmar)
Slow Response
If operation of the switch is slowed for any reason (by cold
weather, low air pressure, etc.), the switch will continue to
blink until the suspension completes a dump or fill. As in
the normal response, the LED comes on steady and stays
illuminated when the suspension if fully deflated.
Abnormal Response
If the LED blinks for more than 10 seconds, the
suspension dump mechanism may not be operating
properly. Bring the vehicle to an authorized Freightliner
service facility for testing. If the ignition is turned off
while the vehicle is in dump mode, the power to the
dump solenoid is cut off to prevent battery drain, and the
suspension system will autofill the rear air springs. The
suspension will also autofill if the vehicle is operated with
the suspension dumped, and the speed is over 5 mph
(e.g. -- driver forgot to inflate the bags or there was a
system failure).
To lower the rear of the vehicle quickly, press the upper
half of the rocker momentarily (at the LED). To raise the
suspension to its normal height, press the upper half of
the rocker switch again.
Summary of Contents for Kountry Star 2022
Page 1: ...SM 2022...
