Issued by the factory under document number 0-1-M65 EN, this 629-page Manitou MT 523 repair manual PDF is the workshop book for the MT 523 lift truck family, covering four variants including the MLT 523 Turbo and Série A + MONO-ULTRA builds. Engine and axle work fill most of the book, from cylinder head and crankshaft assembly to axle teardown, troubleshooting and special tools. Hydraulic schematics trace oil from the gear pump and steering pump through the pressure relief valve, shock valve and hydrostatic steering unit, and wiring diagrams map the starter, alternator, preheating resistor, fuse box and relays. Change the MLT 523 Turbo's hydraulic return cartridge every 500 hours, and spec 10 micron return filtration against 100 microns on suction. The pump is apart and one number is missing. Bookmarked chapters and a searchable text layer take you straight to the right page, so your truck is lifting again before the shift ends.
What's Inside This Manitou MT 523, MLT 523 Turbo Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General Instructions and Safety Notice | 1-21 | Lift Truck Characteristics, Filters Cartridges and Belts, Lubricants and Fuel |
| Engine | 22-211 | Cylinder Head Assembly, Piston and Connecting Rod Assembly, Crankshaft Assembly, Timing Case and Drive Assembly, Cylinder Block Assembly, Engine Timing, Lubrication System |
| Axle Assembly - Axle | 212-439 | General Information, General Specifications, Safety Instructions, Disassembly Operations, Assembly Operations, Troubleshooting, Special Tools |
| Hydraulic | 440-491 | Gear Pump, Steering Pump, Pressure Relief Valve, Shock Valve, Hydrostatic Steering Unit, Filtration |
| Transmission | 492-607 | Hydrostatic Pump, Hydrostatic Motor, Drive Shaft, Boost Pump, Control Valve, Rotary Group |
| Electricity | 608-629 | Battery, Starter, Alternator, Preheating Resistor, Fuse Box, Relay |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Battery | 12 V - 105 Ah - 680 A EN | p. 8 |
| Alternator | 12 V - 65 A | p. 8 |
| Filtration Return | 10 Microns | p. 9 |
| Filtration Suction | 100 Microns | p. 9 |
| Fuel filter cartridge change periodicity | 500 H | p. 12 |
| Atomiser clamp setscrew torque | 22 Nm (16 lbf ft) 2,2 kgf m | p. 158 |
| Cooling Circuit Capacity | 14.5 Liters | p. 19 |
| Hydraulic Oil Tank Capacity | 102.5 Liters | p. 19 |
| MLT 523 Turbo Série A + MONO-ULTRA | ||
| Hydraulic return oil filter cartridge change periodicity | 500 H | p. 12 |
| Suction strainer for hydraulic oil tank clean periodicity | 1000 H | p. 12 |
| Engine Oil Capacity | 6.2 Liters | p. 19 |
| MT 523 Série A + MONO-ULTRA | ||
| Engine Oil Capacity | 6.1 Liters | p. 19 |
Manitou MT 523, MLT 523 Turbo Common Problems This Manual Covers
Manitou MT 523 hydrostatic steering unit steering wheel hard to turn, turning on its own, or excessive play
Check the hydraulic oil level first; the tank holds 102.5 liters per page 19. Inspect the 100 micron suction strainer and the 10 micron return filter. Then test the steering pump, pressure relief valve and shock valve before you condemn the hydrostatic steering unit. While you are there, look for oil leaks around the unit.
Manual Section: Hydraulic p. 440Diesel fuel lift pump weak static pressure or air trapped in the fuel system
Test the fuel lift pump static pressure with no delivery against 41/69 kPa (6/10 lbf/in2) on page 167. If it reads low, fit a new pump with a new joint and tighten the setscrews gradually and evenly to 22 Nm (16 lbf ft). Bleed the system using the air elimination procedure, and change the fuel filter cartridge every 500 H.
Manual Section: Engine p. 167Engine fuel injection atomiser fault with set and reset pressure out of specification on test
Remove the suspect atomiser and test its set and reset pressure against 300 atm (4410 lbf/in2) 30,4 MPa. When you refit it, tighten the clamp setscrew to 22 Nm (16 lbf ft) following page 158 and torque the high-pressure fuel pipe union nuts to 22 Nm. Renew the leak-off pipe sealing washers and tighten the banjo bolt to 9,5 Nm (7,0 lbf ft).
Manual Section: Fuel System Troubleshooting p. 158Thermostat, coolant pump or fan fault with the engine cooling system running hot
Check the coolant level before anything else; the cooling circuit holds 14.5 liters per page 19. Next, test the thermostat, inspect the coolant pump, and check the fan for damage and secure mounting. Check these one at a time and confirm each before you pull more parts off the engine.
Manual Section: Cooling System TroubleshootingFront or rear axle vibration, noise, steering difficulty or poor differential action when driving
Check the oil in both differentials and all four wheel reducers before you tear anything down. Fill the front differential to 7 liters, the rear to 5.5 liters, and each wheel reducer to 0.8 liter, per page 20. If the noise or vibration is still there, inspect the axle for wear using the troubleshooting chart.
Manual Section: Axle Assembly - Axle p. 212Hydrostatic transmission drive pressures reading out of adjustment at the pressure measuring points
Measure the pressure at each transmission pressure measuring point before you change any adjustment. Inspect the boost pump, control valve, hydrostatic pump and hydrostatic motor, then carry out the hydrostatic transmission adjustment step by step. Recheck every measuring point after adjusting. Open the rotary group only if the pressures still will not come into line.
Manual Section: Transmission p. 492Frequently Asked Questions
What are the hydraulic pressure specifications for the MLT 523 Turbo?
The hydraulic circuit for the MLT 523 Turbo has a maximum rating capacity of 90 L/min for the lifting, tilting, telescoping, and attachment circuits, with a pressure of 260 Bar. The steering circuit also has a maximum rating capacity of 90 L/min, with a pressure of 140 Bar. p. 13
What is the fuel filter replacement interval for the Manitou MT 523 and MLT 523 Turbo?
The fuel filter cartridge (part number 49660) is changed every 500 hours, per the filters, cartridges and belts table on page 17.
What are the hydraulic return and suction filter replacement specs for the Manitou MT 523 and MLT 523 Turbo?
The hydraulic return oil filter cartridge (part number 602096) should be changed every 500 hours. The suction strainer for the hydraulic oil tank (part number 224726) should be cleaned every 1000 hours. p. 17
What is the inlet and exhaust rocker valve clearance spec on the Manitou MT 523 and MLT 523 Turbo?
The clearance for both the inlet and exhaust rocker valves on the Perkins 903-27A and 903-27B engines is 0.20 mm for the inlet and 0.45 mm for the exhaust, measured when cold. p. 7
What is the connecting rod nut torque for the Manitou MT 523 and MLT 523 Turbo engine?
The torque specification for the connecting rod nuts on the Perkins 900 Series engine is 77 Nm (57 lbf ft). p. 43
Do I get instant access to this Manitou MT 523 Repair Manual?
A 629-page Repair Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print this Manitou MT 523 manual?
Yes. Many mechanics print the section they need for their own shop and bring it to the bench.
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