MP24.9736
17JUN09
SECTION II
625/625S SERIES LEVELING SYSTEMS
COMPONENT INSTALLATION
The clear control box cover must be removed to program the sensing unit. Program the sensing unit as follows:
Direction:
Suspension Type:
When replacing the clear glass after programming the sensing unit, it is important that the rubber glass retaining
gasket is properly seated completely around the glass cover. This will help keep moisture out of the control box.
Proper grounding of the power unit assembly is critical.
IMPORTANT: No more than four ring terminals are allowed on one grounding stud or bolt. If necessary, the pump
mounting bolt can be used to attach the ground cable to the assembly. Always protect these connections from
corrosion with some type of sealant such as Red Air Dry Enamel (RANVAR), number B6-665, made by the P.D.
George Company. Refer to MI95.54 Information Bulletin which can be obtained in the Information Bulletin section
or from the HWH web site.
Glass cover pointed to the "North" - move JP2 only.
Glass cover pointed to the "South" - move JP1 and JP2.
Glass cover pointed to the "East" - move neither jumper.
Glass cover pointed to the "West" - move JP1 only.
Spring suspension - Do Not move JP3 or JP4.
Air suspension - Move JP3 only.
For a detailed explanation and diagrams for jumper placement see "Jumper Placement For Electronic Sensing Units",
MP44.1600 AND MP44.1601 located in SECTION IV of this manual.
The power unit/control assembly (with or without the control box) must be mounted solidly and supported at both ends of the
mounting pan or bracket. It is also advisable to attach a brace from the top of the control box bracket to a solid frame member
or support. This brace is not necessary if the box is mounted remote from the power unit. The level sensing unit is mounted in
the control box and excess shaking or vibrations can interfere with the performance of the level sensing unit. Mounting the
power unit in a compartment is acceptable but the floor of the compartment must be solid with adequate supports under the
floor. Floor support should be added if the support supplied by the compartment floor is questionable. The class A style
power unit can be mounted with the pump mounting bolts or bolted through the pump tray. Either way, both ends of the
assembly must be solidly supported. If the pump mounting bolts are not used to secure the power unit assembly, make
sure they are properly tightened before completing the installation. The class C style power unit assembly mounting
bracket has mounting holes at the center of the assembly and at the end of the assembly. Both areas of the mounting bracket
should be solidly supported and bolted.
All grounding of the system including the pump motor, solenoid
valves and control box is accomplished through the pump housing. The pump housing is the square block between the pump
motor and fluid reservoir. The mounting bolts for the power unit go into the pump housing. There is also a ground stud that
screws into the pump housing. If the class A style power unit assembly is secured to a solid frame member with the pump
mounting bolts, that will probably supply an adequate ground for the system. If the power unit is secured through the pump
tray or if a class C style power unit assembly is being installed, a No. 2 ground cable or cable that is an equivalent size to the
main battery cable for the master relay, should be used to ground the power unit assembly to a main frame rail. The ground
cable can be attached to the ground stud screwed into the pump housing. A ground cable should always be applied to
the power unit assembly when the assembly is mounted in a compartment, even if the compartment is of a metal
construction. Adding the ground cable to assure a good system ground is a good idea in any installation.
CLASS C STYLE UNIT
Figure 11
CLASS A STYLE UNIT
Attach Brace Here
Pump Housing
Ground Stud
Support and Mounting Area
Pump Mounting Bolt
Support and Mounting Area
Pump Mounting Bolt
Support and Mounting Area
Attach Brace Here
