Keeping a Mitsubishi triplex mast lifting square and quiet across the 5M15D to 5M35D forklift truck series takes 38 pages of factory instruction, and Mast Supplement 99739-151T0 holds them for all five models. This Mitsubishi 5M15D–5M35D Series service manual supplement covers the mast only, not the engine or the rest of the truck: removal with the lift bracket, then teardown and reassembly through rollers, strips, both lift cylinder stages, chain and hydraulic lines. Rollers and strips can also come out with the mast left on the truck, and a troubleshooting chart works through load drift, mast noise, chain tension and uneven fork tip height. Set mast strip clearance at 0.1 to 0.5 mm (0.004 to 0.020 in.) and hold main roller to thrust surface clearance at 1.0 mm or less. Night shift, your truck down, nobody to ask. Bookmarked and text searchable, this PDF is yours once bought and stays with your trucks for good.
What's Inside This Mitsubishi 5M15D–5M35D Series Manual
| System | Pages | Key Topics |
|---|
| Mast System | 7-8 | Structure and Function (Triplex Mast) |
| Mast Operation | 9 | Operation of Triplex Mast |
| Removal and Installation | 10-12 | Mast and Lift Bracket Assembly (Triplex Mast Removal) |
| Disassembly and Reassembly | 13-24 | Triplex Mast (Disassembly, Reassembly, Installing Lift Bracket Rollers) |
| Removal and Installation of Mast Rollers and Strips Without Removing Mast From Truck | 25-33 | Triplex Mast (Chain Tension Inspection and Adjustment, Checking Chain Elongation, Clearance Between Lift Bracket Roller and Inner Mast) |
| Troubleshooting | 34 | Inner Mast Movement, Lift Chain Tension, Mast Noise, Fork Tip Height |
| Service Data | 35-36 | Chain Extension, Main Roller Diameter, Side Roller Diameter, Mast Dimensions, Lift Bracket Dimensions, Finger Bar Bend |
| Tightening Torque for Standard Bolts and Nuts | 37-38 | Nominal Size, Pitch, Metric Fine Thread, Spring Washer Torque |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| All Models |
| Mast strip clearance | 0.1 to 0.5 mm (0.004 to 0.020 in.) | p. 29 |
| Clearance between main roller circumference and mast thrust surface F | 1.0 mm (0.04 in.) or less | p. 29 |
| Clearance G (Lift bracket middle/lower roller) | 0.1 to 0.5 mm | p. 17 |
| Clearance F (Lift bracket upper/middle/lower roller) | 1.0 mm or less | p. 17 |
| Clearance G1 (Side roller) | 0.1 to 0.5 mm | p. 18 |
| Clearance H (Second lift cylinder) | 1.6 mm or less | p. 22 |
| Tightening torque for tilt cylinder socket bolt | 153 to 182 N·m | p. 32 |
| 5M15D, 5M20D, 5M25D |
| Tightening torque for Nuts 1, 3 (5M15D/5M20D/5M25D) | 98 +49/0 N·m | p. 27 |
| 5M30D, 5M35D |
| Tightening torque for Nuts 1, 3 (5M30D/5M35D) | 147 +49/0 N·m | p. 27 |
