8
Model in this series provide eight forward speeds and three reverse, consisting of a 5-speed
front section and a 3-speed auxiliary section. The auxiliary section contains LO and HI
range ratios, plus a deep reduction.
The range ratio LO is used only as a starting gear in severe conditions. The other four
ratios are used once in LO range and once again in HI range. The button is used once
during the upshift sequence and once during the downshift sequence.
Shifting is simple and easy with the Roadranger repeat "H" shift pattern. The gear shift
lever position for 5th is the same as 1st, 6th is the same as 2nd, 7th is the same as 3rd, and
8th is the same as 4th.
To obtain deep reduction (LO-LO), first make sure range selection lever is down for low
range. Then, move deep reduction button forward.
High Speed Downshift Protection
The Orion control module is equipped with advanced diagnostic features to evaluate the
integrity of the system and provide operator feedback of a system fault. In addition, if the
fault shall result in a condition that compromise the reliability of the transmission or result
in a safety risk, the system logic will compensate and default to a safe mode. The diagnostic
capability of the control module includes identification of the following component
failures. The service light used for identification of a component failure is on for 2 seconds
upon vehicle start up to allow for identification of a service light burn-out.
Prevent Deep Reduction when is selected High range
To prevent transmission damage and operator confusion, the system is designed to avoid
the deep reduction when is selected high range. This is prevented by a mechanical interlock
in the master control valve that prevents selection of this configuration. However, the
DFMEA analysis indicated that there are electrical and pneumatic failure modes that can
result in this configuration. The control module is equipped with logic to recognize this and
automatically shift the transmission to high range.
General Information
