Belt Conveyor Installation & Commissioning: The Factory Procedure, Step by Step

Belt conveyors rarely fail because the steel was too light or the motor too small. They fail in the first weeks because the frame was out of line, an idler was installed backwards, the belt was tensioned by guesswork, or the conveyor was handed over after an hour of empty running. This guide is the installation and commissioning procedure our service engineers use in the field, condensed from the Tianyi belt conveyor installation manual. It covers preparation, the erection sequence, the tolerances that keep a belt centred, drive and pulley alignment, idler orientation, take-up tensioning, the two-hour no-load run, the staged load test, and the maintenance schedule that starts on day one. If you want the short version first, read our belt conveyor installation guide; this article is the factory-level detail behind it.

1. Why Installation Quality Decides Whether the Conveyor Works

A belt conveyor is a system, not a machine. The belt is both the carrying surface and the traction element, and it only runs centred and at full capacity if four things are true at once: the frame is straight, the pulleys are square to the centreline, the idlers are at the right height and angle, and the tension is correct. Get any one of them wrong and the belt will tell you — usually by moving sideways.

The problems that appear during the first weeks of operation are overwhelmingly installation problems, not design problems:

• Mistracking: the belt drifts to one side, wears its edges and spills the load.
• Spillage at the transfer points: the skirtboard does not seal, or the chute discharges off-centre.
• Premature belt and splice damage: a belt that is over-tensioned, pinched by a misaligned idler or rubbed by a poorly set cleaner.
• Motor overload and nuisance trips: a drive fighting a belt that is being steered by the structure.
• Noise and vibration: loose frames, misaligned couplings, seized idlers.

2. Before Erection: Documents, Unpacking and Foundations

Installation starts before the first bolt is tightened. The manual is explicit about the preparation stage because most rework later traces back to something that was skipped here.

• Accept the foundation first. Check the dimensions, elevation, planeness and anchor-bolt positions against the foundation drawings and the project specification. Installation is carried out to the relevant code for continuous conveying equipment, together with the project's own technical requirements.
• Unpack against the packing list and assembly drawings. Count every component, check for transport damage, and repair or replace anything that is deformed, cracked or missing before it goes into the structure.
• Read the manuals for the machine and for every bought-in component. Motor, reducer, brake, backstop, fluid coupling, couplings and motorised pulley each have their own installation, adjustment and special-tool requirements. Assuming they are all "standard" is how bearings get preloaded incorrectly and couplings get fitted dry.
• Check preservation and free rotation. Turn rotating parts by hand before installation. Anything that does not turn freely is a problem now, not later.
• Store belts and lagging correctly. Keep belting out of direct sun, away from oil, heat and sharp edges, and do not stack it in a way that puts a permanent fold in the carcass.

3. The Erection Sequence: From Centreline to Belt Splice

The order matters. Each step assumes the previous one is complete and checked, and doing them out of order is how frames end up stressed and belts end up twisted.

1. Mark the centreline and benchmark elevation. Set out the head, intermediate and tail frame positions from the same centreline, and establish a level datum that every frame section can be measured against.
2. Install the frame: head frame → intermediate frames → tail frame. Align and temporarily bolt the sections. Do not final-tighten until the whole line has been checked for straightness and squareness.
3. Install the return idlers and the bend and tail pulleys. These set the lower line of the belt and the return path.
4. Lay the belt out on the return (flat) idlers. On an incline, secure the upper end of the belt before releasing it — an unsecured belt on a slope can run away and is a serious hazard.
5. Install the carrying idler sets. Check tilt direction and height as you go; correcting them now is far easier than after the belt is tensioned.
6. Install the take-up, the drive pulley and the drive unit. Align the drive pulley to the centreline before the drive is coupled to it.
7. Route the belt over the head and tail pulleys. Check that it is not twisted and that it sits correctly in every trough.
8. Splice the belt. Whether the splice is vulcanised or mechanical, check its squareness and centreline. A splice that is not square will steer the belt for the rest of its life.
9. Tension the belt with the take-up. Tension both edges equally and check tracking at low speed before the full run.
10. Install the cleaners, backstop, skirtboards, guide chutes, guards and covers. These are part of the machine, not an afterthought; a conveyor commissioned without them is not ready to run.

4. Frame Accuracy: The Tolerances That Prevent Mistracking

The belt follows the structure. If the frame weaves, the belt weaves. That is why the installation manual specifies frame straightness as a measured tolerance rather than a matter of judgement.

4.1 Centreline straightness

Two additional rules apply on top of the table. In any 25 m length, the centreline deviation must not exceed 5 mm. And on a reversible conveyor, where the belt can mistrack in either direction, the installation must be tighter: the straightness is held to two-thirds of the values above.

4.2 Intermediate frame accuracy

Measure with a tensioned piano wire or laser for the centreline, a spirit level or laser for elevation, and a tape for the diagonals. Record the readings section by section; a frame that is within tolerance at every joint but cumulative out of line over 200 m is still out of tolerance.

5. Drive Unit and Pulley Installation

The drive unit should be assembled at the factory wherever transport allows, and connected to the drive pulley on site as a complete unit. Large, heavy drives that cannot be shipped assembled are sent in components and assembled on site, following the individual manuals for the motor, reducer, brake, backstop, fluid coupling, couplings and motorised pulley.

• Check the foundation. Verify position, elevation and planeness against the general arrangement and foundation drawings. Where secondary grouting is required, it is carried out to the project specification.
• Follow the assembly order. Fit the couplings to the motor and reducer shafts first, then mount the reducer, then mount the motor. Adjust the height of each foot with metal shims — no more than three shims at any one point.
• Align the coupling. Check both angular and parallel alignment, and the coupling gap, against the coupling manufacturer's figures. A coupling that is close enough to bolt together is not necessarily aligned.
• Check the brake and backstop. Confirm the brake shoe-to-drum clearance and that the braking torque matches the duty. Confirm the backstop is free in the running direction and locks in the reverse direction.
• Set the fluid coupling fill. The medium (oil or water) and its quantity must match the transmitted power. This setting is also the tool used later to balance current between motors on a multi-drive conveyor.

5.1 Pulley installation

• Grease the bearings before installation. The bearing housings should be filled with lithium-based grease to about two-thirds of the free volume.
• Check the lagging direction. On a herringbone (chevron) rubber lagging, the apex of the pattern must point in the direction of belt travel. The pattern is directional: fitted the wrong way round it pushes water and fines the wrong way and encourages mistracking. A reversible conveyor must use diamond-pattern lagging, which has no direction.
• Protect the lagging during lifting. Do not lift the pulley on a sling that bears on the rubber; use the shaft or the bearing housings with a spreader.
• Adjust the pulley position. Use shims under the bearing housings and the adjusting screws on the frame to bring the pulley axis square to the conveyor centreline, within the alignment tolerance.

6. Idler Installation: Orientation, Height and Transition Zones

Idlers do three jobs: they support the belt and the load, they shape the belt into a trough, and — with the right tilt — they help keep it centred. Installing them is simple; installing them correctly is where most mistracking is prevented.

• Forward tilt must match belt travel. This applies on both the carrying and the return side. An idler tilted the wrong way steers the belt off-line instead of centring it, and no amount of adjustment elsewhere will fully compensate.
• Every roller must turn freely. Spin each one by hand. A stiff or seized idler will flat-spot the belt and can start a fire in a dusty plant.
• Height tolerance. Except for self-aligning and transition idlers, the upper surfaces of the rollers must lie in one plane, or on a common arc at convex and concave curves. The height difference between any three adjacent idler sets must not exceed 2 mm, and not more than 5 mm in any 100 m. The symmetry of the idler centrelines is held to 3 mm.
• Transition zones are not optional. They open the belt gradually from trough to flat, reducing edge tension and preventing the load from spilling as the belt flattens.
• Impact idlers belong under the loading point. They absorb the energy of the falling material and are the cheapest way to extend belt life at a transfer.

7. Take-Up Systems and Belt Tensioning

The take-up does two things: it provides the tension the drive needs to transmit power without slipping, and it absorbs the elongation the belt develops over its life. The right type depends on the length, power and duty of the conveyor.

• Tension both edges equally. A belt tensioned more on one side will mistrack immediately.
• Tension for the duty, not by feel. The belt must not slip at the drive pulley during a full-load start, and it must still have enough slack at the lowest point to allow the take-up to compensate as it stretches.
• Re-check after the first hours of running. New belts seat and stretch; the tension set at installation is rarely the tension that is correct after the first day.
• Guard the weight zone. On a gravity or winch take-up, fit limit switches and protective fencing within the full travel range of the weight, as required by the manual.

8. Accessories: Cleaners, Skirtboards, Safety Devices and Guards

The accessories are what turn a running belt into a production machine. They are also the parts most often left until last — and the parts whose absence causes the most spillage, dust and injuries.

• Belt cleaners. A head primary cleaner (doctor blade) removes the bulk of the carryback; a secondary cleaner or rotary brush removes the film. On the return side, an H-type or plough cleaner keeps the belt and the return idlers clean. Set the blades for light, even contact — enough to clean, not enough to groove the belt.
• Skirtboards and guide chutes. The loading zone is sealed with rubber skirts along its full length, with impact bars or cushion idlers underneath. The seal controls spillage and dust, and it must not pinch the belt.
• Safety devices. Fit and test the pull-cord emergency stop, the belt misalignment switch, the belt tear detector and the slip or speed detector. A protection device that has not been tested is not a protection device.
• Guards and railings. Guard the head and tail pulley nip points, the drive couplings, the gravity take-up weight zone and every walkway edge. Access to emergency stops must stay clear.
• Discharge devices. Where the conveyor feeds several points, fit the plough dischargers or diverter chutes and check that each one clears the belt completely and seals when closed.

9. No-Load and Load Commissioning: The Staged Test Procedure

Commissioning is done in two stages, and the first stage is not optional. The conveyor runs empty for at least two hours, is adjusted, and only then is loaded — in steps.

9.1 Checks before the first start

• Lubricant grade and quantity at every point, as specified.
• Fluid coupling medium (oil or water) and quantity matched to the transmitted power.
• Brake shoe-to-drum clearance and braking torque matched to the duty.
• Reducer input shaft rotation and backstop direction correct.
• All transmission parts turn freely by hand, with no binding.
• Foundation and frame bolts tightened; site welds complete; electrical signals, controls, protection and insulation checked against the electrical documentation.
• Jog the motor to confirm rotation direction. With a fluid coupling, leave the coupling unfilled for the jog; without one, disconnect the high-speed coupling first.

9.2 No-load run: at least two hours

Run the conveyor empty and watch it. The manual lists what to look for, and each item is a question with a yes or no answer:

• Is anything rubbing — especially anything rubbing the belt?
• Is the belt tracking within 5% of its width? If not, adjust before continuing.
• Is there abnormal noise or vibration anywhere in the line?
• Are the reducer, fluid coupling and other lubricated points leak-free?
• Are oil and bearing temperatures rising normally, or abnormally?
• Do the brake, limit switches and protection devices operate promptly and reliably?
• Do the cleaner blades contact the belt evenly?
• Does the take-up move freely, without jamming?
• Have any foundation or frame bolts worked loose?

9.3 Load run: 20% → 50% → 80% → 100%

Load the conveyor in steps, with at least two hours of continuous running at each step. Start at about 20% of rated load, then 50%, 80% and 100%. Where the process requires it, add a 110–125% full-load start and run test. Loading gradually lets a fault appear at a controlled load, where it can be corrected, instead of at full production, where it becomes damage.

While the conveyor is loaded, also measure belt speed, throughput, start and stop times, and motor current at rated load. On a multi-drive conveyor, the current is the simplest indicator of whether the motors are sharing the load; if they are not, balance them with the fluid-coupling fill.

10. Operation, Inspection and Maintenance After Handover

The manual is clear that the service life of a belt conveyor depends as much on operation and maintenance as on the equipment itself. The handover is the start of that regime, not the end of the project.

10.1 Operating rules

• Do not use the conveyor for duties outside its design.
• Do not run it overloaded.
• Keep every alarm and protection device in working order.
• Keep the route to every emergency stop clear, and check the switches regularly.
• Provide adequate lighting at every transfer point.
• Guard nip points and the area under the gravity take-up.
• Only trained personnel may adjust the drive or the safety devices.
• Never clean, lubricate or replace parts on a running conveyor.
• Never tamper with a safety device to keep the line running.

10.2 Operator inspection

During operation, the operator should patrol the line and watch the items that fail first: motor temperature and noise; brake action and brake-drum contact; reducer oil level and noise; belt tracking and belt damage; bearing temperature and noise; the condition of each transfer point; chute blockage; the condition of pulleys, idlers, cleaners and the take-up; housekeeping at the head, tail and drive frames; and the state of the electrical controls. Record abnormalities, and stop immediately in an emergency.

10.3 Maintenance intervals

In addition to daily inspection, a minor service is normally carried out monthly and a major overhaul every six to twelve months, shortened or extended to suit the site and the duty.

10.4 Lubrication schedule

10.5 Taper-lock bush check

On drive and bend pulleys fitted with taper-lock bushes, check every screw's locking torque after the first 500 hours of operation, then every 5,000 hours. A bush that has been allowed to work loose will damage the shaft and the pulley hub, and the repair is far more expensive than the check.

10.6 Pulley bearing reference