Skyjack SJIII 4740 Operating Manual
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Skyjack SJIII 4740 Operating Manual

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OPERATING MANUAL (ANSI/CSA)
DC ELECTRIC SCISSORS
MODEL SJIII 4740
198735AGA
April 2018

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Summary of Contents for Skyjack SJIII 4740

  • Page 1 OPERATING MANUAL (ANSI/CSA) DC ELECTRIC SCISSORS MODEL SJIII 4740 198735AGA April 2018...
  • Page 2 This manual is based on Serial Number(s): SJIII 4740 70 200 001 & Above Please refer to the website (www.skyjack.com) for older Serial Numbers. Skyjack Service Center Parts & Service (Europe) Unit 1 Maes Y Clawdd 3451 Swenson Ave. St. Charles,...
  • Page 3 It may also be used to alert against unsafe practices. IMPORTANT IMPORTANT indicates a procedure essential for safe operation and which, if not followed, may result in a malfunction or damage to the MEWP. SJIII 4740 Page 3...
  • Page 4 Section 1 - About Your MEWP ........................ 5 Read and Heed ..............................5 Safety Rules ................................6 Section 2 - Familiarization ........................13 Familiarization of Model SJIII 4740 ....................13 Component Identification ........................14 Visual & Daily Maintenance Inspections ..................18 Function Tests ..........................25 Winching and Towing Procedures ....................32 Emergency Lowering Procedure .....................33...
  • Page 5 Service Policy and Warranty SKYJACK warrants each new product to be free of defective parts and workmanship for the first 2 years or 3000 hours, whichever occurs first. Any defective part will be replaced or repaired by your local SKYJACK dealer at no charge for parts or labor.
  • Page 6 Common sense dictates the use of protective clothing when working on or near machinery. Use appropriate safety devices to protect your eyes, ears, hands, feet and body. Any modifications from the original design are strictly forbidden without written permission from SKYJACK. SJIII 4740...
  • Page 7 Over 300V to 50KV Over 50KV to 200KV Over 200KV to 350KV Over 350KV to 500KV Over 500KV to 750KV Over 750KV to 1000KV FAILURE TO AVOID THIS HAZARD WILL RESULT IN DEATH OR SERIOUS INJURY! 60023AD-ANSI SJIII 4740 Page 7...
  • Page 8 Section 4, maximum rated inclines listed Table 4.5. Table 4.3. • DO NOT operate on surfaces not capable of holding the weight of the MEWP including SJIII 4740 Page 8...
  • Page 9 • AVOID overhead obstructions. aware overhead obstructions or other possible hazards around MEWP when • DO NOT alter or disable lifting or driving. limit switches or other safety devices. SJIII 4740 Page 9...
  • Page 10 • DO NOT place materials on the guardrails or materials that exceed the confines of the • DO NOT use under influence of guardrails unless approved by Skyjack. alcohol or drugs. • STUNT driving and horseplay are prohibited. • DO NOT exceed the rated capacity of the MEWP .
  • Page 11 • has safety devices which have been Skyjack recommends the use of a fall restraint altered or disabled. system to keep an occupant within the confines • has been tagged or locked out for of the platform, and thus not expose the occupant non-use or repair.
  • Page 12 Notes SJIII 4740 Page 12...
  • Page 13 Section 2- Familiarization SJIII Series 2.1 Familiarization of Model SJIII 4740 WARNING MEWP Familiarization should be given only to individuals who are QUALIFIED And TRAINED to operate an MEWP . Do not operate this MEWP without proper authorization and training. Failure to avoid this hazard could result in death or serious injury.
  • Page 14 MEWP is on a firm level surface. SJIII 4740 Page 14 It is the responsibility of the operator to read, completely understand and follow all instructions and warnings contained in this operating manual and on the aerial platform.
  • Page 15 Brake auto reset valve plunger Brake hand pump SJIII 4740 Page 15 It is the responsibility of the operator to read, completely understand and follow all instructions and warnings contained in this operating manual and on the aerial platform.
  • Page 16 Figure 2-5. Emergency Lowering System Emergency Lowering Switch Emergency Lowering Valve SJIII 4740 Page 16 It is the responsibility of the operator to read, completely understand and follow all instructions and warnings contained in this operating manual and on the aerial platform.
  • Page 17 Selecting “ ” drive position energizes the drive circuit. WARNING Skyjack scissor lifts are to be operated Figure 2-6. Platform Control Console from the operator’s position on the platform with the control box secured on the mounting bracket at the front right Lift/Drive/Steer Enable Trigger Switch - This portion of the platform.
  • Page 18 • ground area under the MEWP SJIII 4740 Page 18 It is the responsibility of the operator to read, completely understand and follow all instructions and warnings contained in this operating manual and on the aerial platform.
  • Page 19 Section 2 - Familiarization Visual & Maintenance Inspection SJIII 4740 (Back View) Base Control Console Ladder Free-wheeling Valve 110V Outlet Main Power Receptacle Disconnect Switch 2.3-5 Entrance Side • 110V Outlet Receptacle Ensure receptacle is free from dirt and obstructions.
  • Page 20 Use original or manufacturer-approved parts and components for the MEWP . SJIII 4740 Page 20 It is the responsibility of the operator to read, completely understand and follow all instructions and warnings contained in this operating manual and on the aerial platform.
  • Page 21 Wheel/Tire Assembly can adversely affect stability. Therefore, The MEWP is equipped with solid rubber replace tires only with the exact Skyjack- tires. Tire and/or wheel failure could result in approved type. Failure to operate with an MEWP tip-over. Component damage may...
  • Page 22 Visual & Maintenance Inspection Section 2 - Familiarization SJIII 4740 Diagonal Flashing Lights Electrical Panel Hydraulic Pump & Motor Main Manifold Hydraulic/Electric Hydraulic Oil Tray Tank 2.3-7 Hydraulic/Electric Tray Side • Hydraulic Pump and Motor Ensure tray latch is secure and in proper Ensure there are no loose or missing working order.
  • Page 23 Ensure all switches and controller are returned to neutral and are properly secured. SJIII 4740 Page 23 It is the responsibility of the operator to read, completely understand and follow all instructions and warnings contained in this operating manual and on the aerial platform.
  • Page 24 Ensure rollers’ path of travel are free from dirt and obstructions. SJIII 4740 Page 24 It is the responsibility of the operator to read, completely understand and follow all instructions and warnings contained in this operating manual and on the aerial platform.
  • Page 25 Section 2 - Familiarization Function Tests SJIII 4740 (Back View) Lower/ Free-wheeling Brake Auto-Reset Brake Hand Neutral/Raise Valve Valve Plunger Pump Switch Emergency Stop Platform/Off/Base Main Power Button Key Switch Disconnect Switch 2.4 Function Tests 2.4-2 Base Control Console Function tests are designed to discover any malfunctions before MEWP is put into service.
  • Page 26 Function Tests Section 2 - Familiarization SJIII 4740 (Back View) Lower/ Free-wheeling Brake Auto-Reset Brake Hand Neutral/Raise Valve Valve Plunger Pump Switch Emergency Stop Platform/Off/Base Main Power Button Key Switch Disconnect Switch • Test Base Emergency Stop 3. Select and hold off/platform/base key switch to “...
  • Page 27 Section 2 - Familiarization Function Tests SJIII 4740 (Back View) Lower/ Free-wheeling Brake Auto-Reset Brake Hand Neutral/Raise Valve Valve Plunger Pump Switch Emergency Stop Platform/Off/Base Main Power Button Key Switch Disconnect Switch • Test Emergency Lowering • Test Free-wheeling 1. Ensure path of intended motion is clear.
  • Page 28 ” left and “ ” right. Result: Steer wheels should turn left and right. SJIII 4740 Page 28 It is the responsibility of the operator to read, completely understand and follow all instructions and warnings contained in this operating manual and on the aerial platform.
  • Page 29 MEWP to stop immediately. SJIII 4740 Page 29 It is the responsibility of the operator to read, completely understand and follow all instructions and warnings contained in this operating manual and on the aerial platform.
  • Page 30 Result: MEWP should not move forward or backward. SJIII 4740 Page 30 It is the responsibility of the operator to read, completely understand and follow all instructions and warnings contained in this operating manual and on the aerial platform.
  • Page 31 Result: MEWP should move slower than when it was in stowed position. SJIII 4740 Page 31 It is the responsibility of the operator to read, completely understand and follow all instructions and warnings contained in this operating manual and on the aerial platform.
  • Page 32 Ensure MEWP is on level ground. Chock or block wheels to keep MEWP from rolling. SJIII 4740 Page 32 It is the responsibility of the operator to read, completely understand and follow all instructions and warnings...
  • Page 33 Release emergency lowering valve handle (item 2). SJIII 4740 Page 33 It is the responsibility of the operator to read, completely understand and follow all instructions and warnings contained in this operating manual and on the aerial platform.
  • Page 34 Notes SJIII 4740 Page 34...
  • Page 35 Maintenance must be performed by trained and competent personnel who are familiar with mechanical procedures. Death or serious injury could result from the use of an MEWP that is not properly maintained or kept in good working condition. SJIII 4740 Page 35...
  • Page 36 Major Components Section 3 - Operation 3.2 Major Components Platform Control Console Main Platform Manual Storage Extension Platform Maintenance Supports Lifting Mechanism Base Hydraulic/Electric Battery Tray Tray Pothole Protection Device SKYJACK Model SJIII 4740 SJIII 4740 Page 36...
  • Page 37 6” toe boards and mid-rails. The platform can be entered from the rear through a spring- returned gate with latch. The platform is also equipped with a manual extension platform. An AC outlet is also located on the platform. SJIII 4740 Page 37...
  • Page 38 These weldments will automatically rotate for reduced ground clearance when elevating the MEWP . If the pothole protection device has not fully lowered, the drive function will be disabled. Figure 3-2a. Battery Charger SJIII 4740 Page 38...
  • Page 39 “locked out” to prevent further use until a complete inspection of the mechanism is performed by a qualified technician. 3.5-5 Maintenance Supports Figure 3-5. Maintenance Supports SJIII 4740 Page 39...
  • Page 40 The guardrail system must be upright and all pins must be locked in place. Death or serious injury could result if the guardrail system is not upright or properly locked. SJIII 4740 Page 40...
  • Page 41 Status LEDs - These LEDs indicate the operating or fault status of the inverter. On/Off Switch - This diagnostic slide switch activates or terminates inverter operation. It should remain in on position. SJIII 4740 Page 41...
  • Page 42 The control box with long cable may be connected to the lower base control connector or to the WARNING platform control connector. Skyjack scissor lifts are to be operated from the operator’s position on the NOTE platform with the control box secured on...
  • Page 43 Perform a thorough jobsite inspection prior to operating the MEWP to identify potential hazards in your work area. Front Side Rear Side Figure 3-11. Control Box with Long Cable Outside Platform SJIII 4740 Page 43...
  • Page 44 Section 2.3 Section 2.4. IMPORTANT If MEWP is damaged or any unauthorized variation from factory-delivered condition is discovered, MEWP must be tagged and removed from service. SJIII 4740 Page 44...
  • Page 45 • has safety devices which have been altered either “ ” raise or “ ” lower position. Release or disabled. switch to stop. Failure to avoid these hazards could result in death or serious injury. SJIII 4740 Page 45...
  • Page 46 NOTE If the tilt alarm sounds and the platform does not, or only partially raises, immediately lower the platform completely and ensure that the MEWP is on a firm level surface. SJIII 4740 Page 46...
  • Page 47 Return controller to neutral center position to stop. Release “ ” enable trigger switch. WARNING To protect against unintended movement of the MEWP , push in the emergency stop button after you have arrived at your desired location or elevation. SJIII 4740 Page 47...
  • Page 48 Upright Bar WARNING To protect against unintended movement of the MEWP , push in emergency stop Upright Bar button after you have arrived at your desired location or elevation. Figure 3-12. Variable Position Manual Extension Platform SJIII 4740 Page 48...
  • Page 49 Use the ladder to dismount from platform. On base control console, select off/platform/base key switch to “ ” off position and remove the key. Turn main power disconnect switch to “ ” off position. SJIII 4740 Page 49...
  • Page 50 Pin C guardrails. Pin B (If Equipped) Figure 3-13b. Extension Top Rail Pins WARNING Before operating this MEWP , check the Exit the platform. guardrail system for loose or missing locking pins. The guardrail system must SJIII 4740 Page 50...
  • Page 51 Figure 3-13c. Rear Gate Folded Down Remove locking pin from right side guardrail and fold it down. Remove locking pin from left side guardrail and fold it down. Figure 3-13e. Guardrails Folded Down SJIII 4740 Page 51...
  • Page 52 WARNING Ensure that you maintain three points of contact when using the ladder to mount/dismount platform. Use the ladder of MEWP to access platform. Close the gate. SJIII 4740 Page 52...
  • Page 53 Extension Handrail Extension Rail WARNING Any lowered guardrail will create a fall hazard. Remain away from the side of the platform while raising or lowering the guardrails to avoid falling. Figure 3-16. Extension handrail locking pin locations SJIII 4740 Page 53...
  • Page 54 MEWP . It may be necessary to use a stable elevated surface that provides firm footing for the operator to Figure 3-20. Fold down the right guardrail. be at an appropriate height, with both hands free. SJIII 4740 Page 54...
  • Page 55 Refer to Figure 3-22 for hand positions. Lock into place by installing pins . Ensure the detent ball of the pin is all the way through. Figure 3-23. Fold down the extension guardrail and lock in place. SJIII 4740 Page 55...
  • Page 56 Figure 3-25. Control box mount and control cable Carefully raise left guardrail up and insert left mid- railing clamp locking pin locations rail pins, located at the front, center, and back. SJIII 4740 Page 56...
  • Page 57 The guardrail system must be upright and all pins must be locked in place. Death or serious injury could result if the guardrail system is not upright or properly locked. SJIII 4740 Page 57...
  • Page 58 Only qualified personnel shall operate the MEWP machinery during lifting. during loading/unloading. When it is necessary to lift the Skyjack MEWP the Be sure vehicle capacity and loading equipment following conditions must be met: hoists, chains, straps, etc., are sufficient to withstand maximum MEWP weight.
  • Page 59 The MEWP can be lifted with a forklift from • MEWP speed should be on high torque setting the sides but Skyjack does not recommend (if equipped). this use. Lift with forks in designated pockets as illustrated in Figure 3-28.
  • Page 60 Fold the guardrails if necessary. Refer to Section 3.9 for guardrail folding procedure. Using as low a speed as practical and the operator positioned behind the MEWP, drive forward through doorway. Use the ladder to dismount from platform. SJIII 4740 Page 60...
  • Page 61 Death or serious injury could result if the guardrail system is not upright or properly locked. Once the platform control console is securely reconnected and guardrails up, normal operation may continue. SJIII 4740 Page 61...
  • Page 62 Lower the platform. WARNING Do not reach through the scissor assembly when the platform is raised without the maintenance support properly positioned. Failure to avoid this hazard could result in death or serious injury. Figure 3-29. Maintenance Supports SJIII 4740 Page 62...
  • Page 63 When changing the input voltage wait WARNING until all the LEDs are OFF or wait a Use original or equivalent to the original minimum of 20 seconds before switching parts and components for the MEWP . on the new voltage. SJIII 4740 Page 63...
  • Page 64 3 LEDs blink four times simultaneously: Input or output over current. No action required, charger will correct and restart automatically. 100% LED lamp blinks: Charger 18-hour timer has timed out due to battery problem. SJIII 4740 Page 64...
  • Page 65 Try connecting the charger to a different AC outlet (on a different circuit) in the building. If the AC supply checks good, the charger should be replaced. SJIII 4740 Page 65...
  • Page 66 Use the original or equivalent to the original parts amber manual. and components for the MEWP . Charging Solid Charger output is output yellow active. Charge Current profile/ algorithm N/A. error or fault/ display error code Select Current charge charging N/A. profile algorithm SJIII 4740 Page 66...
  • Page 67 ON. The resulting arcing could cause the batteries to explode. If the charger must be disconnected, first disconnect the AC power supply cord from its outlet, then disconnect the charger DC connections. SJIII 4740 Page 67...
  • Page 68 Notes SJIII 4740 Page 68...
  • Page 69 4’ (1.2 m) Extension deck O P T I O N A L E Q U I P M E N T Flashing Light Dual flashing diagonal lights Inverter Board carrier Heavy duty pipe rack 400A SJIII 4740 Page 69...
  • Page 70 This decal is located on the scissor assembly. It must be completed after an annual inspection has been completed. Do not use the aerial platform if an inspection has not been recorded in the last 13 months. Pictorial Description Inspection Date Inspector Signature SJIII 4740 Page 70...
  • Page 71 Mid-rail height of: 26.9 in. (0.68 m) (measured from the platform floor to the top of the mid-rail) Mid-rail height of: 20.9 in. (0.53 m) (measured from the platform floor to the top of the mid-rail) SJIII 4740 Page 71...
  • Page 72 NOTE: The LCP or OUP that an individual surface can withstand varies from structure to structure and is generally determined by the engineer or architect for that particular structure. SJIII 4740 Page 72...
  • Page 73 Intermixing tires of different types or using tires of types other than those originally supplied with this equipment can adversely affect stability. Therefore, replace tires only with the exact Skyjack- approved type. Failure to operate with matched approved tires in good condition may result in death or serious injury.
  • Page 74 Maximum Tilt Cutout MODEL Wind Speed Setting Number of Number of Capacity Capacity Persons Persons 500 lb. 250 lb. 28 mph 4740 2 Persons 1 Person 1.5° x 3.5° 227 kg 113 kg 45 km/h 403A SJIII 4740 Page 74...
  • Page 75 B - Perform Scheduled Maintenance Inspection. Refer to Service & Maintenance manual. * - Maintenance must be performed only by trained and competent personnel who are familiar with mechanical procedures. † - Refer to Skyjack's website @ www.skyjack.com for latest service bulletins prior to performing quarterly or yearly inspection.
  • Page 76 Model: Hourmeter Reading: Operator's Name (Printed): Date: Time: Operator's Signature: Each item shall be inspected using the appropriate section of the Skyjack operating manual. As each item is inspected, check the appropriate box. INSPECTION FREQUENCY - PASS  FREQUENTLY - FAIL ...
  • Page 77 Notes SJIII 4740 Page 77...
  • Page 78 Notes SJIII 4740 Page 78...
  • Page 79 Label Legend Label Legend Safety Red Safety Red indicates DANGER. Safety Orange Safety Orange indicates WARNING. Safety Yellow Safety Yellow indicates CAUTION. Safety Green Safety Green indicates emergency lowering. Safety Blue Safety Blue indicates safety information. SJIII 4740 Page 79...
  • Page 80 Labels Section 5 Labels and Nameplates - Model SJIII 4740 Right Side Label Pictorial Description Skyjack Logo Skyjack logo - 20” White Skyjack Logo Skyjack logo - 17” White Caution Tape Stripe Caution stripe Model Number Product Identifier SJIII 4740...
  • Page 81 Section 5 Labels Labels and Nameplates - Model SJIII 4740 Right Side (Continued) Label Pictorial Description Wheel Load Indicates rated wheel load. Keep Clear Keep clear. Stay away from MEWP when in operation. Crushing Hazard Danger - Crushing hazard MOTOR CONTOLLER...
  • Page 82 Labels Section 5 Labels and Nameplates - Model SJIII 4740 Front Side Top View Label Pictorial Description Crushing Hazard Danger - Crushing hazard Caution Tape Stripe Caution stripe Lift and Tie Down Points Only use these points for lifting or tying down.
  • Page 83 Section 5 Labels Labels and Nameplates - Model SJIII 4740 Left Side (Continued) Fall Protection Anchorage Outlet Box Railing Pins Label Pictorial Description Connect Platform AC Supply Connect AC power supply here for platform accessory outlet. Falling Hazard - Railing Pins (Vertical) (If Equipped) WARNING! Falling Hazard.
  • Page 84 Labels Section 5 Labels and Nameplates - Model SJIII 4740 Electrical Panel Hydraulic Tray 300A Battery Tray Label Pictorial Description Ground Circuit Breaker Push to reset ground circuit breaker. Power Circuit Breaker Push to reset power circuit breaker. Hydraulic Oil ATF Dexron III* Replace hydraulic fluid with ATF Dexron III only.
  • Page 85 Section 5 Labels Labels and Nameplates - Model SJIII 4740 Left Side Label Pictorial Description Skyjack Logo Skyjack logo - 20” White Skyjack Logo Skyjack logo - 17” White Wheel Load Indicates rated wheel load. Keep Clear Keep clear. Stay away from MEWP when in operation.
  • Page 86 Labels Section 5 Labels and Nameplates - Model SJIII 4740 Left Side (Continued) Label Pictorial Description Annual Inspection Ensure that work platform has received annual inspection prior to operation. Emergency Lowering Procedure Refer to Operating manual. 1. Push in “...
  • Page 87 Section 5 Labels Labels and Nameplates - Model SJIII 4740 138211AB 138211AB Label Pictorial Description Hazard Identification and Manual Storage Box Refer to Section 1: Safety Rules. Read and understand the outlined risks associated with this MEWP prior to operation.
  • Page 88 Labels Section 5 Labels and Nameplates - Model SJIII 4740 138211AB Label Pictorial Description Operator’s Daily Inspection Refer to the Operating manual. Perform visual inspection and function tests at the beginning of each shift. Refer to Section 4: Maintenance and Inspection Schedule.
  • Page 89 Section 5 Labels Labels and Nameplates - Model SJIII 4740 138211AB Label Pictorial Description How to engage maintenance supports for inspection or maintenance. Refer to Operating manual. 1. Remove all material from platform. 2. Raise platform until there is adequate clearance to swing down maintenance supports.
  • Page 90 Labels Section 5 Labels and Nameplates - Model SJIII 4740 138211AB Label Pictorial Description Main Power Disconnect Rotate clockwise to turn on main power, rotate counterclockwise to turn off main power, insert padlock to lock in position. Lift and Tie Down Points Only use these points for lifting or tying down.
  • Page 91 Section 5 Labels Labels and Nameplates - Model SJIII 4740 Cylinder 138211AB Label Pictorial Description Serial Plate* Product identification and specifications *Serial plates will vary, may not be as shown. Maintenance Support Deploy maintenance support here. Orifice Installed Orifice installation warning...
  • Page 92 Labels Section 5 Labels and Nameplates - Model SJIII 4740 Platform Control Console Label Pictorial Description Platform Control Console Squeeze “ ” trigger to enable controller. Operate “ ” rocker switch to steer. Move controller handle forward to “ ” raise or backward to “...
  • Page 93 WARNING Cancer and Reproductive Harm- https://www.p65warnings.ca.gov/.
  • Page 94 www.skyjack.com...

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