Bell B18D B20D B25D B30D ADT Service Manual Mk 7.2 Rev A – PDF Download

Description

Bell B18D B20D B25D B30D ADT Service Manual Mk 7.2 Rev A

This is the Bell Equipment technical service manual covering the Small Truck range of articulated dump trucks built to Mk 7.2, released under Revision A in February 2013 as document number 872360. It is the workshop-level reference used for diagnosis, testing, adjustment and repair of the B18D, B20D, B25D, B25DN and B30D machines, and it also covers the supporting Mercedes-Benz engine platform (OM 906 LA shown and OM 904 LA referenced) fitted across these trucks.

Content is written for an experienced technician: the chapters assume familiarity with diesel engines, hydro-mechanical transmissions, load-sensing hydraulics and CAN-controlled electronics, and the procedures are laid out as step-by-step on-the-job guides with specifications, test points, pressure values and fault-code tables rather than basic operator instructions.

File Details

• Manual type: Service Manual (workshop, diagnosis, tests and repair)
• Brand: Bell Equipment Company SA (Pty) Ltd
• Covered models: B18D 6X4 ADT, B18D 6X6 ADT, B20D 6X4 ADT, B25D 6X6 ADT, B25DN 6X6 ADT, B30D 6X6 ADT
• Applicable to machine range: Small Truck articulated dump trucks, Mk 7.2
• Document number: 872360
• Revision: Rev A
• Issue date: February 2013
• Language: English
• Format: PDF (digital download)

Chapters Covered

• Operational Check-Out Procedure — ignition sequence checks, engine start, brake checks, steering, bin and engine-speed verification
• Engine — EUI fuel system, pre-delivery, delivery and residual stages, cold-start operation, valve clearance, exhaust brake adjustment, compression and fuel pressure testing
• SCR — components, metering device, AdBlue pump module, spray nozzle, NOx sensor, frame module, defrosting and purge cycle
• Electrical System — schematic symbols, earth connections, fuse and relay layout, control unit inputs and outputs, connector pin-outs and wire colour codes
• Fault Codes & MDU Fault Display — ADM engine fault codes (J1939 and K-line), PLD-MR engine fault codes, CCU, MDU and OEU fault codes
• MDU Menu Structure — default display, accessing service mode, main menu and daily checks display
• Transmission Allison 3000PR ORS — torque converter, planetary gear sets, hydraulic circuits, speed sensors, control module, stall testing and diagnostic codes
• Transmission ZF 6 HP 592 C PLUS — Ecomat 2 PLUS, valve schematics, hydraulic pressures, retarder, gear shift control and error codes
• Pneumatic System — system schematic and operation, air drier and unloader valve, park brake, inter-axle lock and fault finding
• Hydraulic System — circuit symbols, main and secondary steering pumps, manifold, service brake charging, bin operation, pressure setting and cycle time tests
• Heating, Ventilation and Air Conditioning — air conditioning cycle, heater core, component location and fault finding
• Servicing, Schedules & Lubrication Chart
• 150 Hours, 500 Hours, 1 000 Hours, 2 000 Hours, 3 000 Hours and 4 000 Hours Service and Checks
• As Required Service
• Miscellaneous Service and Checks — serpentine belt, wheel change, batteries, bulbs and headlight adjustment
• Storage and Preservation
• Trouble Shooting — engine, transmission, axles, wheels, tyres, wet disc brakes, hydraulics, electrical and cab

What This Manual Gives You

Beyond the chapter list, the value of the Bell B18D B20D B25D B30D ADT Service Manual Mk 7.2 Rev A is the depth of the diagnostic content. The electrical section alone runs through every control unit on the truck — SSM, CCU2 (J1, J2 and J3), OEU (J1, J2 and J3), ADM-Mercedes ECU, MR engine ECU in both Tier 2/3 and Tier 3b variants, Allison TCU, ZF TCU, the memory module and the onboard weighing unit — with pin-by-pin inputs and outputs, wire colours and connector views. Fault code tables cross-reference the J1939 SPN/FMI codes against the K-line and PLD-MR codes with remedial actions, so a technician reading a code from the MDU can go straight to the suspect circuit.

Transmission coverage is split by machine fitment: the Allison 3000PR ORS chapter covers the Gen 4 control system with hydraulic circuit diagrams for neutral, first, second, third, fourth, fifth, sixth and reverse, the clutch and solenoid apply charts, latch valve operation and limp-home behaviour; the ZF 6 HP 592 C PLUS chapter covers the Ecomat 2 PLUS with valve schematics, internal and external solenoids, sensor renewal with shim measurement procedures, retarder operation and a full table of error codes. Both include stall test procedures with model-specific stall speeds.

Hydraulic and pneumatic content is equally detailed. The hydraulic chapter includes schematics for the B18D and B20D without wet disc brakes, the B25D and B30D without wet disc brakes, and the B30D with wet disc brakes, plus manifold views, priority valve and brake accumulator charging circuit descriptions, and procedures for setting main pump residual pressure, main pump compensating pressure, emergency steering pump pressure, steering pressure, brake circuit pressures and bin tip pilot pressure. The pneumatic chapter covers the air drier and unloader valve charging and purging cycles, park brake, exhaust brake, inter-axle lock, seat height and horn circuits with pressure specifications.

Servicing and Scheduled Maintenance

The scheduled service chapters are broken into 150-hour, 500-hour, 1 000-hour, 2 000-hour, 3 000-hour and 4 000-hour intervals, each listing the specific checks and replacements due at that point. Typical 500-hour work includes engine oil and filter change, air intake inspection, Racor fuel filter draining, transmission fluid cold and hot checks against the dipstick marks, park and service brake pad wear measurement, transfer case oil level at the sight glass, front axle suspension strut height measurement using tool 280662, drive line and suspension fastener checks, all breathers, cab air filter, batteries, greasing of all points including bin pivots, articulation joints, oscillation tube, tailgate pivots and prop shaft slip joints, hydraulic oil level, service brake accumulator routine test and bin shock pad clearance. The 4 000-hour chapter covers fan belt replacement, hydraulic oil change with a reservoir capacity of 78.8 L (20.8 USGAL) and total system capacity of 155 L (41 USGAL), and pneumatic block breather filter replacement.

Specifications and Testing

Throughout the manual, procedures are anchored to actual values. Engine valve clearance is given as 0.40 mm intake and 0.60 mm exhaust with a 50 Nm locknut torque; fuel pump pressure at slow idle is above 430 kPa and 400–650 kPa at fast idle; oil pump pressure specification is 50 kPa at slow idle and 250 kPa at fast idle. Transmission pressure tables give port P, D1, D2, D6/D7 values for neutral, neutral-to-drive, and lockup-engaged states at both slow and rated engine speeds. The troubleshooting chapter at the back is a symptom-problem-solution reference covering engine starting and running complaints, transmission, axles, wheels, tyres, wet disc brakes, hydraulics, electrical faults and cab/frame issues.

Why This Manual Matters

Articulated dump trucks in this class carry load-sensing hydraulics, CAN-linked control units and transmission electronics that will not respond to guesswork. Servicing them with the correct residual and compensating pressures, the correct charge band for the brake accumulators, the correct stall test window and the correct fault-code interpretation is the difference between a repair that holds and one that returns. This manual gives you the numbered values, the test port references, the diagnostic code meanings and the calibration procedures that the machine was built around, so any technician working on a B18D, B20D, B25D or B30D Mk 7.2 can follow the same process the original service documentation lays out.

IMAGES PREVIEW

Instant PDF Delivery

This Bell ADT service manual is delivered as a digital PDF download immediately after purchase. There is no shipping, no waiting for a parcel and no physical media. The file can be opened on a workshop laptop, tablet or phone, printed page by page for the bench, or kept on a USB stick in the service truck so the fault-code tables and pressure charts are available at the machine. Because the PDF download is yours to keep, there is no restriction on how many times you reference it across the life of the truck.