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Summary of Contents for Power Step PSA-773D-FS
- Page 1 FOLDING STAIRWAY Manual for Cat 773D Truck Hydraulic Operation Model No.PSA-773D-FS Serial No.:773D - ~ Date Manufactured: August 2012 CAT 773D 19-12-12...
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Page 2: Table Of Contents
FOLDING STAIRWAY Caterpillar 773D Truck Hydraulic Operation CONTENTS Page 3 Section 1 Installation and Mounting instructions Installation Drawings Section 2 Recommended Maintenance Procedure Section 3 Operating Procedure Section 4 Drawings and Repair Parts lists Assembly Complete 4-1 Platform Assembly Parts List 4-2 Fixed Stair Assembly Parts List 4-3 Lower Stair Assembly... -
Page 3: Section 1 Installation And Mounting Instructions
Installation and Mounting Instructions Mounting Bars PS-22683 NOTE Follow all on-site/Mine lifting and safety procedures when installing Power Step Landings to Truck. PROCEDURE See Drawing PS-22683 1. Remove existing cabin landing and cabin-side ladder. 2. Fit Mounting Bars per View 1. Do not tighten bolts. - Page 4 125 +/- 10 on the truck. If it does not measure 125 +/- 10, contact Power Step - some rectification will be required. See Drawing 24803 Page 6 Fit the Stair Assembly (24 390) to the Front Bolting Pad per View 1 Stair Installation and to the Landing per View 2.0 Stair/Landing Connection...
- Page 5 FOLDING STAIRWAY Caterpillar 773D Truck Section 1 Installation Instruction Drawings PS-24802 Front Bolting Pad CAT 773D 19-12-12...
- Page 6 FOLDING STAIRWAY Caterpillar 773D Truck Section 1 Installation Instruction Drawings Landing PS-24803 See Procedure notes Page 4 CAT 773D 19-12-12...
- Page 7 FOLDING STAIRWAY Caterpillar 773D Truck Section 1 Installation Instruction Drawings PS- 24389 Welding of Bolting Pads CAT 773D 19-12-12...
- Page 8 FOLDING STAIRWAY Caterpillar 773D Truck Section 1 Installation Instruction Drawings PS- 24804 Raised Walkway See Procedure notes Page 4 CAT 773D 19-12-12...
- Page 9 Handrails PS- 24805 NOTE Follow all on-site/Mine lifting and safety procedures when installing Power Step Landings to Truck. PROCEDURE See Drawing 24802 Page 10 Fit all the handrails to the stair set per View 1. Note that Bolting Pads for the Bonnet Handrail are to be welded in locations to suit on the front of the radiator surround.
- Page 10 FOLDING STAIRWAY Caterpillar 773D Truck Section 1 Installation Instruction Drawings Handrails PS- 24805 See Procedure notes Page 9 Pg10 CAT 773D 19-12-12...
- Page 11 FOLDING STAIRWAY Caterpillar 773D Truck Section 1 Installation Instruction Drawings Buffer Bracket PS- 24390 PROCEDURE Fit Buffer Socket & Mounting 24 371 in suitable position to receive Buffer when Stair is stowed. Pad 24 371 01 welds to truck bumper behind hinged stair. Before locating and welding Pad to bumper, bolt Socket Bracket to Pad with bolts in slots so Bracket is as high as possible relative to Pad, that is, with adjustment available in slot to allow lowering of bracket on Pad when required to accommodate...
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Page 12: Section 2 Recommended Maintenance Procedure
FOLDING STAIRWAY Caterpillar 773D Truck Section 2 Recommended Maintenance Procedure Daily Visually check stairway and structure for damage, loose components, handrails, etc. Check for any oil leaks Notify the appropriate supervisor for any observed damage or malfunction. 500 Hours Check main mounting bolts for torque. Check oil levels and bushes for wear. -
Page 13: Section 3 Operating Procedure
NOTE: FLOW CONTROL VALVE ADJUSTMENT: The valve should be positioned to restrict the flow and speed of the Power Step when lowering. Adjust the knob on top of the valve by turning left or right (clockwise) when the step is being lowered, until it is lowering at a safe and reasonable speed. -
Page 14: Assembly Complete
FOLDING STAIRWAY Caterpillar 773D Truck Section 4 Assembly Complete PSA-773D-FS Pg14 CAT 773D 19-12-12... -
Page 15: 15 4-1 Platform Assembly
FOLDING STAIRWAY Caterpillar 773D Truck Section 4-1 Platform Assembly PS-22671A See Parts List Page 16 Pg15 CAT 773D 19-12-12... - Page 16 FOLDING STAIRWAY Caterpillar 773D Truck Section 4-1 Platform Assembly PS-22671 See Drawing Page 15 Item Part No. Part Name PS-22671 TOP LANDING PS-22663 RAISED PLATFORM PS-22681 HANDRAIL -TOP LANDING PS-22680-98 HANDRAIL-RAISED WALKWAY PS-22680-99 HANDRAIL-BONNET PS-22680-97 BONNET TOEBOARD(supplied loose) PS-22670 MIRROR POST PS-22670-06 SPACER-MIRROR POST PS-22672-99...
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Page 17: 16 4-2 Fixed Stair Assembly
FOLDING STAIRWAY Caterpillar 773D Truck Section 4-2 Fixed Stair Assembly PS-23253A See Parts List Page 18 Pg17 CAT 773D 19-12-12... - Page 18 FOLDING STAIRWAY Caterpillar 773D Truck Section 4-2 Fixed Stair Assembly PS-23253A See Drawing Page 17 Item Part No. Part Name PS-23253 LANDING & FIXED STAIR FABRICATION PS-22665 STAIR ATTACHMENT BRACKET PS-23266 POWER UNIT BRACKET PS-23265 OUTER HANDRAIL-FIXED STAIR PS-23264 INNER HANDRAIL-FIXED STAIR PS-24380 STAIR SUPPORT PLATE PS-22266...
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Page 19: 19 4-3 Lower Stair Assembly
FOLDING STAIRWAY Caterpillar 773D Truck Section 4-3 Lower Stair Assembly PS-24373A See Parts List Page 20 Pg19 CAT 773D 19-12-12... - Page 20 FOLDING STAIRWAY Caterpillar 773D Truck Section 4-3 Lower Stair Assembly PS-24373A See Drawing Page 19 Item Part No. Part Name PS-24373 BOTTOM STAIR FABRICATION PS-23465 LADDER EXTENSION PS-24376 OUTER HANDRAIL-LOWER STAIR PS-24375 INNER HANDRAIL-LOWER STAIR PS-22266 TREAD (Inc. one on Extension) PS-22233-03 HINGE PLATE SPACER PS-22233-02...
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Page 21: 21 4-4 Hydraulic Cylinder & Plumbing
FOLDING STAIRWAY Caterpillar 773D Truck Section 4-4 Hydraulic Cylinder Assembly P/No. PS-62999-AH NOTE: HYDRAULIC CYLINDER ASSEMBLY P/No PS- 62998-AH includes Part No.s 1 to 10 Item Part No. Part Name PS-62999-A HYDRAULIC CYL. (with hard plumbing ) PS-62999-HPK HARD PLUMBING KIT PS-62999-A HYDRAULIC CYLINDER 2 1/2”... - Page 22 FOLDING STAIRWAY Caterpillar 773D Truck Section 4-4 Hydraulic Cylinder (Valve Diagram) See Drawing Pg. 21 Pg22 CAT 773D 19-12-12...
- Page 23 FOLDING STAIR Caterpillar 773D Truck Section 4-5 Power Pack PS-80103A-SLD See Parts List Pg 25 View B View A Hoses shown dotted Pg23 CAT 773D 19-12-12...
- Page 24 FOLDING STAIR Caterpillar 773D Truck Section 4-5 Power Pack PS-80103A-SLD See Parts List Pg 25 View A View B NOTE. THE RELIEF PRESSURE OF THE POWERPACK IS TO BE SET TO 2800SI. IF THE POWERPACK IS REPLACED,THIS RELIEF PRESSURE WILL NEED TO BE RESET USING INLINE GAUGES.
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Page 25: Power Pack Assembly
FOLDING STAIR Caterpillar 773D Truck Section 4-5 Power Pack PS-80103A-SLD See Photos Pg 23 & 24 Item Part No. Part Name PS-80103A-SLD POWER PACK ASSEMBLY PS-21107-METAL MOTOR ENCLOSURE- SEALED PS-80103A POWER PACK PS-80103-CLAMP CLAMP ELECTRIC MOTOR PS-82415 AUDIBLE ALARM PS-84214 BRIDGE RECTIFIER PS-82492 SOLENOID 24V START MOTOR... - Page 26 FOLDING STAIRWAY Caterpillar 773D Truck Section 4-6 Electrical Controls See Parts List Pg 27 Control Pendant Switch Mounted on Handrail Proximity Switch Assembly Mounted on Fixed Landing Cab Harness & Equipment Refer Wiring Harness Drawings Pg26 CAT 773D 19-12-12...
- Page 27 FOLDING STAIRWAY Caterpillar 773D Truck Section 4-6 Electrical Controls See Photos Pg 26 Item Part No. Part Name PS-73013 CONTROL PENDANT SWITCH PS-73013-B CONTROL PENDANT BRACKET PS-77005 HAND RAIL SWITCH HARNESS PS-77009AR AUTO RAISE HARNESS Optional only PS-77004 CABIN TO SWITCH HARNESS PS-75430 PROXIMITY SWITCH 1 x Optional...
- Page 28 FOLDING STAIR Caterpillar 773D Truck Section 4-6 Electrical Controls - Wiring Diagram Pg. 1 Pg28 CAT 773D 19-12-12...
- Page 29 FOLDING STAIR Caterpillar 773D Truck Section 4-6 Electrical Controls - Wiring Diagram Pge. 2 Pg29 CAT 773D 19-12-12...
- Page 30 FOLDING STAIR Caterpillar 773D Truck Section 4-6 Electrical Controls - Wiring Diagram Pge. 3 WIRING HARNESS 1 Pg30 CAT 773D 19-12-12...
- Page 31 FOLDING STAIR Caterpillar 773D Truck Section 4-6 Electrical Controls - Wiring Diagram Pge. 4 WIRING HARNESS 2 Pg31 CAT 773D 19-12-12...
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