TEST LESSON 13 - PART 1 HYDRAULIC LEVELING SYSTEM ...



HWH® Online Technical School - TEST

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:| |

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|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? |

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|3.) For a NON-BI-AXIS® 400 Series leveling system, how are the four jack control paddle switches/lights labeled? Start from the side of |

|the panel with the ON/OFF switch. |

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|4.) Explain the function of the “bleed” valve for the 400 Series system. |

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|5.) What do the four check valves in the 400 Series NON BI-AXIS® leveling manifold do? |

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|6.) A 400 Series BI-AXIS® leveling system has straight-acting jacks. How many total solenoid valves does the hydraulic manifold have? |

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|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. |

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|8.) What is the biggest difference between the 400 Series BI-AXIS® and NON BI-AXIS® hydraulic manifolds? |

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|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: | |

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|Paddle Switches: | | | | | |

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|10.) What was the first touch panel controlled leveling system HWH® developed? |

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|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: | |

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|600 Series Cable: | |

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|12.) What capability does a 500 Series leveling system have that a 510 Series leveling system does not have? |

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|13.) What is an important rule when replacing a 500 Series 14” control box? |

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|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. | |

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|15.) Mark the parts a 500 Series leveling system with straight-acting jacks has. |

|Breaker Board: | |Horizontal/Vertical Valve:| |½” Wide Touch Panel Cable:| |

| | |Touch Panel: | |7” Control Box: | |

|Flow Switch: | | | | | |

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|Stabilize Valve: | | | | | |

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|16.) Describe the two touch panel cables the 510 Series leveling system could have. |

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|2. | |

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|17.) What are the dimensions of the 510 Series control box? |

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|18.) How many UML connectors does the 510 Series control box have? |

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|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? |

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|20.) How is 510 Series leveling system ON/AUTO button labeled if the system has air dump? |

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|21.) Mark the lights the 510 Series Touch Panel does NOT have. |

|Store Light: | |Dump Light: | |Left Front Yellow Level | |

| | | | |Light: | |

|Excess Slope Light: | | | |Off Light: | |

| | |Right Rear Red Jack | | | |

| | |Down Warning Light: | | | |

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|22.) How many Touch Panel buttons does a 510 Series leveling system without air dump have? |

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|23.) Which two valves are NOT present on a 510 Series leveling system manifold if the system has straight-acting jacks? |

|1. | |

|2. | |

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|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. |

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|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) |

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|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: | |

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|27.) Name a component that was first used with the early 610 Series leveling system. |

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|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? |

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|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? |

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|30.) What is the function of the jack pressure switch? |

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|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? |

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|32.) The 610 Series leveling systems use a different style level sensing unit than the 510 Series leveling systems. True (T) or False |

|(F) |

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|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. |

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|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. | |

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|35.) At one point, the programming for the stabilize sequence changed. How did the program change? |

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|36.) Name several physical differences between the early 610 Series control box and the 610 Central Ground Series control box. |

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|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 | |Touch Panel: | |

| | |Switch: | | | |

|Level Sensing Unit: | |Shuttle Valve: | |Solenoid Valve: | |

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|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. |

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|39.) The first HWH® automatic leveling system that was used with slide-out room extensions was the ________________________ system. |

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|40.) If a jack pressure switch does not come on during the stabilize sequence, what would happen? |

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|Bonus Question 1.) |

|Which automatic leveling system does not need the park brake on to function? |

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|Bonus Question 2.) |

|Which component that all automatic leveling systems use is no longer available but can be replaced with a new style component? |

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|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? |

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