Jib-tip sheave assemblies matched to the hoist rope route

01

Trace the incoming line before identifying the point sheave

Manitowoc’s archived 18000 manual distinguishes mast, strut and jib-top guide sheaves from upper and lower jib points. Identify the wheel by location and rope function in the applicable drawing. [1]

Provide the crane model and serial, jib system, top-section identity and the applicable reeving drawing. Mark the incoming hoist line, the guide being replaced and the outgoing route to the point sheave, load block or weight ball. Include the present photographs from the same viewing direction as the drawing.

The archived 777 manual distinguishes arrangements for a single load line from arrangements for two load lines. Its drawing notes place the crossing of the two lines after the jib-top rope guide. Preserve the exact line arrangement when requesting the replacement package. [2]

For its No. 44 jib, the 18000 manual links guide-sheave positions to the selected lower-point sheave and distinguishes the whip-line route over the upper point. Identify the drawing’s position and locating dimensions in the order, rather than assuming a centred wheel suits every route. [1]

The 777 drawings also identify a load-indicator sheave where fitted and a weight for the block-up limit control. Ask the service provider which sensing and limit-system parts remain installed or accompany the replacement, with their applicable checks. [2]

02

Reconcile the wheel, its supports and the rope-retaining hardware

The 18000 manual calls for rope guard pins, bars and rollers to be installed after routing the rope through its guide sheaves. Its point drawing separately identifies the bearing-clamp arrangement and a rope-retaining pin location. List these parts against the assembly drawing when defining supply. [1]

NSW’s rigging guide explains that an oversized groove can flatten a rope, while an undersized groove can pinch it. It calls for sheaves to be used for their intended crane or hoist and for worn or damaged grooves to be addressed when renewing the rope. Include the mating rope and adjoining sheaves in the service assessment. [3]

Specify whether the offer is a wheel-and-bearing replacement, a pin-mounted set or a larger jib-point package. Have the supplier annotate the supplied parts on the actual drawing and identify every support, spacer, retainer and fitting transferred from the crane.

Agree the service provider’s examination of the removed wheel, pin, bearing seats and structural supports before fitting the replacement. Retain the groove inspection record, assembly identity, lubrication instructions and completed rope-route and retention checks with the machine service record.

Request the crane builder’s capacity-chart and operating documentation for the resulting configuration. A component quotation should state its design and installation basis while the configured crane documentation governs lifting duties.

03

Jib-point sheave and rope-route enquiry

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Crane and jib: [model/serial, jib system, top-section identity and drawing revision]
Rope route: [incoming hoist line, guide location, lower/upper point, block or weight ball]
Mating rope: [specified diameter/construction, groove drawing and inspection findings]
Package: [wheel/bearing set or equipped point, supplied axle, supports, spacers and retention parts]
Guards: [rope-retaining pins, bars/rollers and prescribed clearances]
Services: [bearing/bush, seals, lubrication provisions and access]
Instrumentation: [indicator/limit-system fittings, transferred items and assigned service checks]
Records: [annotated parts drawing, inspection evidence, installation provider and configured crane documentation]

See manufacturer records Send an enquiry through CNFX