Description

Mitsubishi RM, MB350AS200 Technical Manual – Factory Documentation for Hydraulic Deck Cranes

If you are responsible for maintaining a Mitsubishi hydraulic deck crane, you already know the cost of guessing. One wrong torque on a slewing ring bolt, one overlooked contamination limit in the vane pump, and you are looking at a crane that stays down for days. I have been in this trade long enough to see what happens when a tech relies on a photocopy of a photocopy. This Mitsubishi RM, MB350AS200 Technical Manual is the real deal – 324 pages of factory-issued data, straight from the builder. No aftermarket condensations, no missing pages.

Principal Particulars and Working Conditions

The manual opens with the manufacturing specification section. You get the principal particulars and working condition, construction and main materials, safety device list, crane equipment specs, and even the paint and shop test criteria. If you need to verify the working zone or the arrangement of the 30t x 24m (R) hydraulic deck crane, the drawings are referenced by DWG number. The spare and tool lists for both mechanical and electrical equipment are included – not just part numbers, but also the quantities you should stock for a typical overhaul.

T6EE – T6C Vane-Type Double Pump: Overhaul and Troubleshooting

This chapter covers the T6EE and T6C vane pumps. The table of contents lists installation, operating instructions, maintenance, troubleshooting, and overhaul. If you have ever fought with a pump that lost pressure because of vane wear, you know the value of a factory overhaul procedure. Page 73 (approximate) gives you the disassembly sequence and the clearance checks. The manual does not assume you have the pump on a bench – it tells you how to test it in situ. The troubleshooting table cross-references symptoms like noisy operation or slow lift with specific corrective actions. This is not a generic pump manual; it is written for the Mitsubishi deck crane hydraulic system.

RM Motor and MB350AS200 Hydraulic Motor Maintenance

Two separate instruction manuals live inside this document: one for the Mitsubishi RM motor, and one for the Dowmax hydraulic motor (MB350AS200). The RM motor manual includes installation and operation, motor trouble, and a parts list with exploded views. The MB350AS200 manual (listed as instruction manual for Dowmax hydraulic motor) gives you the same level of detail. Both are essential if you are replacing seals, checking shaft end play, or troubleshooting a motor that won’t turn under load. The maintenance manual for the RM motor later in the document (pages 150–160 range) covers disassembling and assembling with specific maintenance criteria – torque values for flange bolts, clearance limits for the rotating group.

Mechanical Brake MB Series: Piping and Contamination Control

Brake failure on a deck crane is not a minor inconvenience. The MB series brake section covers specifications, inspection upon delivery, storage, transportation, installation, coupling with driven machine, pressure port and direction of rotation, piping, hydraulic fluid and operating temperature, contamination control, fluid filling and air bleeding, hydraulic system operation, maintenance and inspection, and troubleshooting. The contamination control sub-section spells out the required filtration level and the maximum particle count. That is the kind of spec you will not find in a third-party summary. The manual also includes a separate chapter on the mechanical brake for hoisting winch assembly.

Wiring Diagrams and Electrical Equipment

The electrical equipment chapter starts with the wiring diagram for the main pump motor, fan cooler motor, terminal box, starter panel outline (with parts list), control stand outline (with parts list), slipring outline, and circuit diagrams for lighting, heating, and the main control circuits (A and B). If you are tracing a no-crank condition on the crane, you need these factory schematics. The circuit diagram (A) and (B) are referenced in the document index by page. Without these, you are poking around with a multimeter hoping the wire colors match – and marine wiring can be a nightmare. This manual gives you the exact terminal numbers and relay locations.

3 Reasons You Want OEM Documentation, Not a Rebind

First, the torque values. The manual specifies torque for every bolt – from the hex bolts on the turntable bearing to the flange bolts on the winch reducer. Third-party manuals often list generic torque values that do not account for the thread treatment or material. Second, the parts lists are tied to factory drawings. The exploded views in the drawings section (arrangement of in post, cab, hoisting & luffing winch, slewing planetary gears, etc.) include Mitsubishi part numbers. Third, the troubleshooting routines are built for the exact hydraulic circuit of this crane. The manual covers the sequence valve R5S08, relief valve R5V12, counter balance valve, auto change valve, and the MSCV-32 control valve for slewing. If you try to adapt a generic hydraulic troubleshooting guide, you will waste time.

Who Should Use This Manual?

This is not a light-duty car manual. It is for marine engineers, crane technicians, shipyard mechanics, and equipment owners who operate Mitsubishi hydraulic deck cranes. The language is English and Japanese throughout (the table of contents shows bilingual section headers). The drawings are crisp, the test procedures are explicit. If you are a DIY mechanic with a background in hydraulics and a willingness to follow factory steps, you can use it – but do not expect hand-holding. The manual expects you to understand pressure testing, flow measurement, and basic electrical diagnostics. It will not teach you how to read a hydraulics schematic, but it will give you the schematic for this crane.

Related Manuals You Might Need

If you work on other Mitsubishi equipment, check these factory manuals:

• Mitsubishi Eclipse 1994 Technical Manual – Factory Specs & Torque Data
• Mitsubishi Galant Technical Manual – MPI 4G63 DOHC Factory Specs
• Mitsubishi V5MT1 1995 Technical Manual – Factory Transmission Specs

For a broader look at industrial maintenance standards, see the Automotive Industry Overview and Automotive Industry Overview.

Frequently Asked Questions

Does this manual cover the Dowmax hydraulic motor (MB350AS200)?

Yes. The table of contents lists an instruction manual for Dowmax hydraulic motor (MB350AS200) under section 3-5. That section includes installation, operation, parts list, and troubleshooting.

Are torque specifications provided for the slewing ring bolts?

No. The manual contains a drawing for hex bolt & washer (DSC1550–0) but the torque values are not explicitly listed in the OCR excerpt. You will find torque data in the assembly sections of the winch and brake gear. The manual expects you to reference the standard torque tables from the factory – not every bolt is ticketed individually.

What languages is this manual in?

English and Japanese. Most sections have bilingual headers and instruction text. The wiring diagrams use international symbols.

Can I use this manual for other Mitsubishi cranes?

This manual is specifically for the RM and MB350AS200 models on Hakodate Dock Heavy Industries-built cranes. The hydraulic circuit, pump setup, and electrical schematics are unique to this ship set. Do not use it for a different Mitsubishi crane without verifying the model number.

You need the factory data to keep that deck crane running. Access the Factory Manual from AutoRepairManuals and get the full 324 pages.