Lesson 13: Hydraulic Leveling System Identification and Operation
PART 2: Computer-Control (Automatic) Leveling Systems
The 400 Series - 610 Central Ground Series
(400/500/510/600/610/610-CG)
Read questions carefully and refer to the lesson when necessary. Information can be in the lesson text or diagrams.
1.) All functions of the 400 Series paddle switch system are controlled directly from the paddle switch panel with either a ground or +12 volt signal. Label the following components as being controlled by GND (ground) or +12 volts.Master Relay: / Stabilize Valve: / Air Dump:
Pump Relay: / Jack Valves: / Horizontal/Vertical Valve:
2.) Concerning the control relays clamped to the pump motor, what is the main difference between the manual controlled leveling systems and the automatic, computer controlled leveling systems?
3.) For a NON-BI-AXIS® 400 Series leveling system, how are the paddle switches/lights labeled? Start from the side of the panel with the ON/OFF switch.
4.) Explain the function of the “bleed” valve for the 400 Series system.
5.) What do the four check valves in the 400 Series NON BI-AXIS® leveling manifold do?
6.) A 400 Series BI-AXIS® leveling system has straight-acting jacks. How many total solenoid valves does the hydraulic manifold have?
7.) How do the 400 Series systems “Stabilize” the vehicle after the auto leveling is complete? It is the same for BI-AXIS® and NON BI-AXIS® systems.
8.) What is the biggest difference between the 400 Series BI-AXIS® and NON BI-AXIS® hydraulic manifolds?
9.) Mark the parts a 400 Series NON BI-AXIS® system has.
Solenoid Valve: / Jack Pressure Switch: / Flow Switch:
Bleed Valve: / Touch Panel: / Breaker/Fuse Board:
Paddle Switches:
10.) What was the first touch panel controlled leveling system HWH® developed?
11.) The 500 Series and 600 Series leveling systems were virtually identical. Both used a 14” control box. The main difference was the touch panel cable and it’s connectors. Describe each cable.
500 Series Cable:
600 Series Cable:
12.) What capability does a 500 Series leveling system have that a 510 Series leveling system does not have?
13.) What is an important rule when replacing a 500 Series 14” control box?
14.) Starting with a 400 Series BI-AXIS® leveling systems, there are only two mechanical failures that will let a jack retract after leveling is complete without actually storing the jacks. List both possibilities.
1.
2.
15.) Mark the parts a 500 Series leveling system with straight-acting jacks has.
Breaker Board: / Horizontal/Vertical Valve: / ½” Wide Touch Panel Cable:
Flow Switch: / Touch Panel: / 7” Control Box:
Stabilize Valve:
16.) Describe the two touch panel cables the 510 Series leveling system could have.
1.
2.
17.) What are the dimensions of the 510 Series control box?
18.) How many UML connectors does the 510 Series control box have?
19.) How can you tell the difference between a 510 Series leveling system and a 610 Series leveling system if you are just looking at the jacks?
20.) How is 510 Series leveling system ON/AUTO button labeled if the system has air dump?
21.) Mark the lights the 510 Series Touch Panel does NOT have.
Store Light: / Dump Light: / Left Front Yellow Level Light:
Excess Slope Light: / Right Rear Red Jack Down Warning Light: / Off Light:
22.) How many Touch Panel buttons does a 510 Series leveling system without air dump have?
23.) Which two valves are NOT present on a 510 Series leveling system manifold if the system has straight-acting jacks?
1.
2.
24.) Describe how the 510 Series leveling system stabilizes the vehicle after the leveling sequence is done with all the yellow level lights out. Include valves that are used and what they do.
25.) The later version of the 510 Series leveling systems and the first version of the 610 Series leveling systems use the same part number Touch Panel. True (T) or False (F)
26.) Mark the components that ARE used with a 610 Series system.
Shuttle Valve: / Flow Switch: / Jack Pressure Switch:
Bleed Valve: / Touch Panel: / Jack Down Warning Switch:
27.) Name a component that was first used with the early 610 Series leveling system.
28.) The early 610 Series leveling systems have a three-wire warning switch. How many resistors are used in the switch and are the values of the switch?
29.) How many ohms of resistance are there between ground and the hack harness wire when both the jack down warning switch and the jack pressure switch are on?
30.) What is the function of the jack pressure switch?
31.) What feature of the round solenoid valve that was first used on the early 610 leveling systems was not present on the hex style valves used on the earlier automatic systems?
32.) The 610 Series leveling systems use a different style level sensing unit than the 510 Series leveling systems. True (T) or False (F)
33.) The lesson shows hydraulic schematics for the different systems including the 510 Series and 610 Series systems. Besides the solenoid valves, shuttle valve, and pressure switch, what is the same about the hydraulic manifold.
34.) For the 610 Series systems with kick-down jacks, there is a specific order in which the system extends the jacks to the vertical position. Put the jacks in the correct order for the kick-down sequence.
1. / 2. / 3. / 4.
35.) At one point, the programming for the stabilize sequence changed. How did the program change?
36.) Name several physical differences between the early 610 Series control box and the 610 Central Ground Series control box.
1.
2.
37.) Mark the parts that are the same for the early 610 Series systems and the 610 Central Ground systems.
Jack Pressure Switch: / Jack Down Warning Switch: / Touch Panel:
Level Sensing Unit: / Shuttle Valve: / Solenoid Valve:
38.) HWH® has incorporated air dump systems into our leveling systems for a very long time. What new type of air dump system was first used with the 610 Central Ground Series system.
39.) The first HWH® automatic leveling system that was used with slide-out room extensions was the ______system.
40.) If a jack pressure switch does not come on during the stabilize sequence, what would happen?
Bonus Question 1.)
Which automatic leveling system does not need the park brake on to function?
Bonus Question 2.)
Which component that all automatic leveling systems use is no longer available but can be replaced with a new style component?
Bonus Question 3.)
Touch Panels are used with manually controlled and computer controlled leveling systems. How can you tell a system is an automatic system simply by looking at the Touch Panel?
C:\0_Web\ml57000(SchoolTech)\ml57000-022-test.doc | Revised: 12MAY17 | Page 5 of 6