Braun RA300 Hydraulics, Deploy and Stow Pressure Relief Valves, Relief Valve Adjustment Procedure

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SYSTEMS DESCRIPTIONS

Hydraulics

M-2202-0102 Hydraulic Pump: Fixed displacement external gear type hydraulic pump with 12 VDC electric motor and 76 cubic inch ÁXLGUHVHUYRLUIRU9%)< and 12V BF3748Y. The Braun Pump Code for 12 volt M-2202- 0102 pumps is 59.

M-2202-0102 Hydraulic Pump: Fixed displacement external gear type hydraulic pump with 24 VDC electric motor and 76 cubic inch ÁXLGUHVHUYRLUIRU9%)< and 24V BF3748Y. The Braun Pump Code for 24 volt M-2202- 0102 pumps is 60.

B-3202-0100 Hydraulic Pump: Fixed displacement external gear type hydraulic pump with 12 VDC electric motor and 76 cubic inch ÁXLGUHVHUYRLUIRU9%)<3 The Braun Pump Code for 12 volt B-3202-0100 pumps is 67.

All RA300 Hydraulic Pumps: The Deploy pressure relief valve is factory set at 1000 psi. The Stow pressure relief valve is fac- tory set at 1250 psi.

Hydraulic Fluid: Use Braun 32840-QT (Exxon® Univis HVI 26) K\GUDXOLFÁXLGDo not mix with

'H[WURQ,,,RURWKHUK\GUDXOLFÁX- ids. Make sure the ramp is fully deployedZKHQFKHFNLQJÁXLG OHYHORUDGGLQJÁXLG)LOOWRZLWKLQ 1" of the top of the reservoir. DO NOT XVHDVROLGSOXJRUÀOOFDS without a breather hole. Doing so will result in pump and/or reser- voir damage.

Contamination: Fluid should be changed if there is visible con- tamination. Inspect the hydraulic V\VWHP F\OLQGHUKRVHVÀWWLQJV VHDOVHWF IRUOHDNVLIÁXLGOHYHO is low.

Deploy and Stow Pressure Relief Valves

7KHVHDGMXVWPHQWVRQWKHSXPSXQLWOLPLWWKHPD[LPXPRLOSUHVVXUHLQWKH system to a safe level. It also keeps the amp draw and battery drain at a minimum when the cylinders reach full stroke.

The Deploy pressure relief valve is preset at 1000 psi. The Stow pressure relief valve is preset at 1250 psi. Do not WDPSHUZLWKWKLVDGMXVWPHQWXQOHVV absolutely necessary (will not stow or deploy ramp) and then, only after contacting The Braun Corporation. Note:7KHÀ[HGQXWRQHDFKDGMXVWPHQW Allen screw is positioned to limit oil pressure to a maximum (Deploy relief valve maximum 1450 psi and Stow relief valve maximum 1700 psi). Do not DWWHPSWWRORRVHQRUUHPRYHWKHRXWHUÀ[HGQXW

Relief Valve Access:7KHUDPSSDQFRYHU VXEÁRRU PXVWEHUHPRYHGWR access the relief valve (access hole not provided).

WARNING

Contact The Braun Corporation before adjusting hydraulic pressure relief valve. Failure to do so may result in serious bodily injury and/or property damage.

Relief Valve Adjustment Procedure

1.Insert a 3/16” Allen wrench into the Allen screw.

6HFXUHWKH$OOHQVFUHZDQGORRVHQWKHKH[MDP QXW LQVLGHQXW %DFNMDPQXWRXWWRRXWHUÀ[HG nut. Note: Do not attempt to loosen or remove

WKHRXWHUÀ[HGQXW

2.Place load on platform (equal to weight not lift- ing).

3.Turn the Allen screw clockwise until pump lifts the load.

4.Secure the Allen head screw and tighten the hex

MDPQXW LQVLGHQXW securely.

Stow Pressure

 

Relief Valve

Hex Jamb Nut

 

 

Allen Screw

Deploy Pressure

Figure P

 

Relief Valves

 

 

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Contents Braun Congratulations Contents Ramp Terminology Ramp Terminology IllustrationRamp Components Terminology Illustration Leftin OutrightIntroduction Ramp Components Ramp Actions and FunctionsRamp Operation Safety Precautions Safety Symbols Safety FIRST! Know ThatRamp Operation Ramp Operation Ramp Access Doors and Interlocks Pre-Operation Notes and DetailsOperation Procedure Review Preventive MaintenanceKeep clear of area in which ramp operates All ramp safety precautions Ramp Passenger SafetyRamp Manual Operation Ramp also. Read and become familiar withBodily injury and/or property damage Ramp Installation Installation / Service Safety PrecautionsInstallation Requirements Installation/Service Safety PrecautionsChassis Requirements Floor Pocket Clear Opening Dimensions Outboard Support Tube RecomÝ Structure Minimum 1-1/2 x 2 steel tub- ing or equivalentClear Door Opening Width Dimension Figure EInstalled Ramp Stowed Installed Ramp DeployedFigure J Electrical ConnectionsElectrical Connections Electrical Connections IllustrationLubrication Diagram LO Light OilDE Door-Ease LG Light GreaseMaintenance and Lubrication Introduction CyclesYear 1250 Cycles Year Ramp deployed fully. Fill to withinSystems Descriptions ElectricalFigure L Hydraulics Relief Valve Adjustment ProcedureDeploy and Stow Pressure Relief Valves Drift OUT Speed Cam Drift in Speed CamTroubleshooting Troubleshooting Diagnosis ChartFaulty or Stow Blank for Layout Electrical Schematic BF3248Y & BF3748Y Power Connections / Control Signals Provided by InstallerWiring Diagram BF3248Y & BF3748Y Electrical Schematic BF3248YP Description SymbolWiring Diagram BF3248YP Relay #2 Wire CodeHydraulic Schematic BF3248Y & BF3748Y HydraulicsHydraulic Diagram and Parts List BF3248Y and BF3748Y Qty Description BF3248Y BF3748YHydraulic Schematic BF3248YP Hydraulic Diagram and Parts List BF3248YP Qty Description BF3248YPRepair Parts Item Qty Description BF3248Y BF3748Y BF3248YPExploded View Specification and Dimensions Daily Preventive Maintenance Sched Pre-Trip InspectionProviding Access to the World Braun Commercial RA300 Transit Ramp
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