Cummins/Onan — Location, Mounting and Enclosure
Installation · genset
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKA, Cummins/Onan HDKAJ, Cummins/Onan HDKAK
Before you start
- Design the genset support structure carefully to prevent the genset from falling from the vehicle and possibly causing a serious road accident.
- EXHAUST GAS AND FIRE ARE DEADLY! — Install a vapor-tight and fire-resistive barrier of approved materials between the genset and the vehicle interior. — Do not duct genset cooling air into the vehicle for heating.
Procedure
- Orient the genset so that the operator’s console will be outboard and accessible.
- Locate the genset so that there is sufficient access for battery, fuel, exhaust, remote control and AC connections.
- Support the genset on a structure able to resist the dynamic weight of 420 lbs (191 kg): ±3 g vertical and ±1 g horizontal.
- Provide at least 0.5 inch (12.7 mm) clearance to the top and 0.25 inch (6.4 mm) clearance to the sides.
- If mounted inside the living space, provide a vapor-tight, fire-resistive compartment of 26 gauge galvanized steel or equivalent.
- Provide cutout openings in a compartment floor at least as large as the cooling air inlet and outlet openings.
- Make sure vehicle components below the genset will not interfere with draining coolant, engine oil and removing the oil and fuel filters.
- Provide access for removing the two fuel pump mounting screws.
- Locate or shield the genset so condensate from air conditioners will not drip on it.
- Provide protection from direct road splash if the genset is located behind a road wheel.
Specs & values
- Top clearance: 0.5 inch (12.7 mm)
- Side clearance: 0.25 inch (6.4 mm)
- Minimum compartment dimensions: Height 22.78 inches (578.6 mm), Width 24.73 inches (628.1 mm), Length 36.85 inches (936 mm)
Full service-parts list: Cummins/Onan HDKA →, Cummins/Onan HDKAJ →, Cummins/Onan HDKAK →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.