HWH 625S SERIES Service Manual

Touch panel-controlled

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Page 1 CORPORATION SERVICE MANUAL HWH TOUCH PANEL-CONTROLLED 625S SERIES HYDRAULIC LEVELING SYSTEM FEATURING: Single Step Touch Panel Leveling Control BI-AXIS Hydraulic Leveling Straight-Acting Jacks (Without Dump) (With Dump) (With Pilot Dump) (With Remote Rocker Switches) HWH COMPUTERIZED LEVELING EXCESS SLOPE EXTEND...
Page 2 This Repair Manual is offered as a guide only. It is impossible to anticipate every problem or combination of problems. For any problems encountered that are not addressed in this manual, contact HWH Corporation for assistance. (800-321-3494) PROCEED WITH SYSTEM OPERATION MI91.1132...
Page 3: Trouble Shooting
3. Check that the oil reservoir is full with the jacks in the fully to the system. retracted position. If the vehicle is equipped with HWH room extensions, refer to the HWH Owners Manual for proper Tightening of hose ends: If tightening a new hose end, position of the room when checking the oil level.
Page 4 CONTROL IDENTIFICATION 625S SERIES LEVELING SYSTEM COMPUTER-CONTROL "MANUAL DUMP" "EXCESS SLOPE" LOWER FRONT Button Indicator light AUTO LEVEL Manual button Indicator light RAISE FRONT Manual button "AUTO LEVEL" Button HWH COMPUTERIZED LEVELING JACK DOWN "NOT IN PARK" Indicator light EXCESS...
Page 5: System Operation
For manual leveling, the HWH touch panel has a "DUMP" button. The "DUMP" button will work if the ignition is on and the park brake is set. If the vehicle uses the HWH air dump valves, the "DUMP" button must be pushed and held until all of the air is exhausted from the vehicle suspension system.
Page 6 625S TROUBLE SHOOTING GUIDE AUTOMATIC OPERATIONS CONTINUED. . . EXCESS SLOPE: Excess slope is when one or two jacks extend as far as they can without turning a yellow level light out. The pump will go to relief and trip a 3000# pressure switch on the leveling manifold. The "EXCESS SLOPE" light will come on. Jacks that have not been extended will not extend when the "EXCESS SLOPE"...
Page 7 LED. If the LEDs go out, the problem is the warning switch. NOTE: The magnet CR10 CR11 in the jack may be bad. If a new switch does not fix the problem, contact HWH customer service. If the LED stays on with the warning switch unplugged, unplug IGN OUT the 12 pin gray connector from the back of the control box.
Page 8 4400 6240 and 4. (It will take about 30 seconds for the poly fuse to reset). If voltage is now TO HWH GROUND STUD - 6240 TO 3000 LB PRESSURE SWITCH - 8100 12 PIN present, replace the touch panel. If there is still no voltage, remove the 6800 wire from...
Page 9 26-RED RIGHT FRONT PRESS SW PIN 1 27-RED RIGHT REAR PRESS SW PART 7. If F6 is blown, there may be a short on the 9300 wire going to the HWH 28-RED LEFT REAR PRESS SW 29-RED NOT USED +12V...
Page 10 LEDs 11 and 17 (YELLOW) and LED 12 (RED) are on and LED 18 (RED) is off. ELECTRICAL CONNECTION DIAGRAM 625 SERIES LEVELING SYSTEM CONTROL BOX - LED - FUSE LOCATION AND DESCRIPTION Find the 4 pin UML plug for the pilot dump in the HWH harness. While pushing the RELAY DESCRIPTION FUSE 1-YELLOW...
Page 11 PROBLEM WITH INPUT VOLTAGE IN THE 4-PIN CONNECTOR. NOTE: THE TRAVEL RELAY IS NOT USED ON VEHICLES EQUIPPED WITH HWH AIR DUMP SYSTEMS. IF A YELLOW LED IS NOT LIT, THERE IS A IT IS ONLY USED WITH PILOT OPERATED AIR DUMP b.
Page 12 10 volts. If the vehicle is equipped with any MP85.1035 27APR05 MP85.1035 HWH hydraulic room extensions, make sure none of the room extension solenoid valves are open. ELECTRICAL CONNECTION DIAGRAM 625 SERIES LEVELING SYSTEM...
Page 13 SYSTEM - AIR DUMP 1400 6240 TO HWH 4400 GROUND STUD 6240 SEE: MP85.1035 TO HWH GROUND STUD - 6240 TO 3000 LB PRESSURE SWITCH - 8100 12 PIN BROWN NOTE: ROOM EXTENSION MANIFOLD NOT SHOWN 12 PIN 4 PIN...
Page 14 LED indicates the warning switch is on. The warning switch LEDs and inputs are: 4-PIN CONNECTOR. NOTE: THE TRAVEL RELAY IS NOT USED ON VEHICLES EQUIPPED WITH HWH AIR DUMP SYSTEMS. IF A YELLOW LED IS NOT LIT, THERE IS A IT IS ONLY USED WITH PILOT OPERATED AIR DUMP PROBLEM WITH THE CONTROL BOX, TOUCH PANEL SYSTEMS.
Page 15 If the jack retracts and the manifold is equipped with a velocity valve, the valve is most likely the problem. If there is no velocity valve, there may be a check valve or solenoid valve problem. Contact HWH technical service. ELECTRICAL CONNECTION DIAGRAM 625 SERIES LEVELING SYSTEM SEE: MP65.600C...
Page 16 RIGHT FRONT 1000 6235 1200 2200 9300 6110 9301 PILOT DUMP in the jack may be bad. If a new switch does not fix the problem, contact HWH TO IGNITION CONNECTION 6230 - 6231 MASTER TO ACCESSORY BY OEM FUSE WARNING...
Page 17 If adjusting the switch does not work, replace the switch. 4-PIN CONNECTOR. NOTE: THE TRAVEL RELAY IS NOT USED ON VEHICLES EQUIPPED WITH HWH AIR DUMP SYSTEMS. IF A YELLOW LED IS NOT LIT, THERE IS A IT IS ONLY USED WITH PILOT OPERATED AIR DUMP PROBLEM WITH THE CONTROL BOX, TOUCH PANEL SYSTEMS.
Page 18 NOTE: THE TRAVEL RELAY IS NOT USED ON both front jacks will continue to extend. VEHICLES EQUIPPED WITH HWH AIR DUMP SYSTEMS. IF A YELLOW LED IS NOT LIT, THERE IS A IT IS ONLY USED WITH PILOT OPERATED AIR DUMP PROBLEM WITH THE CONTROL BOX, TOUCH PANEL SYSTEMS.
Page 19 PROBLEM WITH INPUT VOLTAGE IN THE 4-PIN CONNECTOR. NOTE: THE TRAVEL RELAY IS NOT USED ON VEHICLES EQUIPPED WITH HWH AIR DUMP SYSTEMS. IF A YELLOW LED IS NOT LIT, THERE IS A IT IS ONLY USED WITH PILOT OPERATED AIR DUMP PROBLEM WITH THE CONTROL BOX, TOUCH PANEL SYSTEMS.
Page 20 RED (18) LED for travel. Only the RED (18) LED should be lit. If LED 18 is lit, check for +12 volts between the white ground wire and the 9301 wire in the HWH 4 pin UML plug. If power is not present, the problem is either the white ground wire, the 9301 wire or their connections.
Page 21 MANUAL VALVE RELEASE PROCEDURES 1 1/2" DIAMETER VALVE RELEASE SOLENOID VALVE NOTE: DO NOT turn the valve release nut more than 4 and 1/2 (four and one half) turns counter clockwise. Damage to the valve may result. VALVE RELEASE PLASTIC PLUG 2 1/4"...
Page 22 SENSING UNIT MAINTENANCE/SERVICE SENSING UNIT ACCURACY TOLERANCE The sensing unit has an accuracy tolerance of ± 5.4 inches front to rear and ± 1 inch side to side on a 36 foot vehicle. Typical leveling results will be better. SENSING UNIT ADJUSTMENT To adjust the sensing unit, first the vehicle must be level.
Page 23 READ INSTRUCTION SHEET - JUMPER PLACEMENT FOR INSTRUCTIONS 325 AND 625 AFTER MARKET INSTALLATIONS OR STOP THOROUGHLY BEFORE ELECTRONIC SENSING UNIT REPLACEMENT PROCEEDING IMPORTANT: 325 AND 625 ELECTRONIC SENSING UNITS USED IN AFTER MARKET INSTALLATIONS OR REPLACEMENT SITUATIONS ARE PROGRAMMABLE. DURING INSTALLATION OF A SYSTEM OR REPLACEMENT OF AN ELECTRONIC SENSING UNIT DO NOT ASSUME THAT THE SENSING UNIT JUMPERS ARE PRE-SET.
Page 24 READ INSTRUCTION SHEET - JUMPER PLACEMENT FOR INSTRUCTIONS 325 AND 625 AFTER MARKET INSTALLATIONS OR STOP THOROUGHLY BEFORE ELECTRONIC SENSING UNIT REPLACEMENT PROCEEDING IMPORTANT: 325 AND 625 ELECTRONIC SENSING UNITS USED IN AFTER MARKET INSTALLATIONS OR REPLACEMENT SITUATIONS ARE PROGRAMMABLE. DURING INSTALLATION OF A SYSTEM OR REPLACEMENT OF AN ELECTRONIC SENSING UNIT DO NOT ASSUME THAT THE SENSING UNIT JUMPERS ARE PRE-SET.
Page 25 HYDRAULIC LINE CONNECTION DIAGRAM 625 OR 625S SERIES LEVELING SYSTEMS (WITH 4 STRAIGHT-ACTING JACKS) NOTE: BEFORE OPERATING ANY MANUAL VALVE RELEASE READ AND UNDERSTAND PROCEDURE FOR MANUAL JACK RETRACTION IN OPERATOR’S INSTRUCTIONS. THIS MANIFOLD IS SHOWN WITH (1) LARGE VALVE WITH A VALVE RELEASE "T"-HANDLE, (2) SMALL VALVES WITH VALVE RELEASE NUTS...
Page 26 HYDRAULIC SCHEMATIC DIAGRAM 625 - 625S - 725 SERIES LEVELING SYSTEM SHUTTLE VALVE 50 PSI SWITCH MAY NOT 800 PSI TO LEVELING SYSTEM STEEL TUBE SHIFT SHUTTLE BE ON ALL SOLENOID MANIFOLD ASSEMBLY 625 MANIFOLDS VALVE 3000 PSI SWITCH JACK SOLENOID VALVES (4) 50 PSI SWITCH...
Page 27 PRESSURE PRESSURE SWITCH SWITCH WARNING WARNING SWITCH SWITCH 6235 2000 1000 6235 1200 2200 CONNECT TO TOUCH PANEL 12V IGNITION HWH COMPUTERIZED LEVELING MASTER EXCESS FUSE SLOPE AUTO EXTEND EXTEND LEVEL WARNING 5AMP NOT IN MANUAL PARK/ BRAKE LIGHT BUZZER...
Page 28 625 SERIES SINGLE STEP LEVELING SYSTEM PILOT AIR DUMP - PARK BRAKE - MASTER WARNING LIGHT AND BUZZER TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES PRESSURE PRESSURE TOUCH PANEL SWITCH SWITCH HWH COMPUTERIZED LEVELING EXCESS SLOPE WARNING AUTO EXTEND EXTEND WARNING...
Page 29 TO 50 LB PRESSURE SWITCH - 8101 LEVELING MANIFOLD 3400 7601 2400 7600 1400 6240 4400 6240 TO HWH GROUND STUD - 6240 TO 3000 LB PRESSURE SWITCH - 8100 12 PIN BROWN 12 PIN 4 PIN BLACK LEVELING GRAY MANIFOLD...
Page 30 7600 SYSTEM - AIR DUMP 1400 6240 TO HWH 4400 GROUND STUD 6240 TO HWH GROUND STUD - 6240 TO 3000 LB PRESSURE SWITCH - 8100 12 PIN BROWN NOTE: ROOM EXTENSION MANIFOLD NOT SHOWN 12 PIN 4 PIN BLACK...
Page 31 FRONT AIR DUMP SOLENOID 1400 6240 TO HWH GROUND 4400 STUD - 6230 6230 6240 9300 TO HWH GROUND STUD - 6240 9300 TO 3000 LB PRESSURE SWITCH - 8100 12 PIN BROWN 12 PIN 4 PIN BLACK LEVELING GRAY...
Page 32 NOTE: THE TRAVEL RELAY IS NOT USED ON IF THE YELLOW LED’S ARE WORKING BUT NO RED LED VEHICLES EQUIPPED WITH HWH AIR DUMP SYSTEMS. IS COMING ON THERE MAY BE PROBLEM WITH INPUT IT IS ONLY USED WITH PILOT OPERATED AIR DUMP VOLTAGE IN THE 4-PIN CONNECTOR.
Page 33 ELECTRICAL CONNECTION DIAGRAM CIRCUIT BOARD CONNECTOR AND PIN LOCATIONS CR10 CR11 IGN OUT CL CH LD21 (SHIELD) LD22 LD23 4 PIN GRAY LD24 CONNECTOR LD25 LD26 LD27 LD28 A32433 PROGRAM CHIP LD39 LD36 LD37 LD38 MP85.185J 10OCT13...
Page 34 ELECTRICAL CONNECTION DIAGRAM 625 OR 625S SERIES LEVELING SYSTEMS CONTROL BOX CONNECTION INFORMATION 12 PIN BROWN PIN 12 PIN 1 PIN 1 12 PIN PIN 1 PIN 12 BLACK 12 PIN PIN 1 8 PIN GRAY PIN 4 BLACK PIN 12...
Page 35 ELECTRICAL CONNECTION DIAGRAM 625 SERIES LEVELING SYSTEM TOUCH PANEL CONNECTIONS HWH COMPUTERIZED LEVELING EXCESS SLOPE EXTEND EXTEND AUTO LEVEL NOT IN MANUAL PARK/ BRAKE AUTO MANUAL STORE DUMP RETRACT RETRACT TRAVEL MODE EMERGENCY STOP CAUTION! UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
Page 36 MASTER LIGHT/BUZZER CONNECTION DIAGRAM MANUAL LEVELING SYSTEMS 625 SERIES LEVELING SYSTEM A MASTER WARNING INDICATOR SHOULD ALWAYS BE USED. WHEN THE LEVELING SYSTEM HAS STRAIGHT-ACTING JACKS A WARNING BUZZER MUST BE USED. NOTE: BY SUPPLYING IGNITION POWER TO THE WARNING BUZZER AND LIGHT, AND "ACC" POWER TO THE CONTROL BOX, THE SYSTEM MAY BE OPERATED IN ACCESSORY WITHOUT THE BUZZER SOUNDING.
Page 37 Normally the complete harness for this system is supplied by HWH. There are two wires to each valve, a white wire and a black number 9300 wire. The HWH control box switches +12 volts to open the air dump valves.
Page 38 1/4 to 3/4 inch after reaching the ground when used to stabilize the vehicle. NOTE: All hydraulic pressure switches supplied by HWH at this time are manufactured be HWH. These switches all look the same. The switches can be identified by a tag near the Packard connector on the switch wire.
Page 39 This may require a separate ground cable, minimum size #2, to supply the necessary ground for the assembly. The oil level in the pump reservoir should be checked with all HWH cylinders, leveling jacks and/or slides retracted. The oil level should be (1) inch down from the top of the reservoir fill hole.
Page 40 If replacing the o-rings for a solenoid valve use only 0-rings supplied by HWH. TOUCH PANEL: The touch panel supplies operational information to the control box.

HWH 625S SERIES Service Manual

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Summary of Contents for HWH 625S SERIES

Page 3: Trouble Shooting

Page 5: System Operation

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