Multiquip ST-45HRM CE manual ST-45HRMCE CONCRETE PUMP — BRAKING SYSTEM, 5.0WHEEL HUB ASSEMBLIES

ST-45HRM CE CONCRETE PUMP — BRAKING SYSTEM

5.0WHEEL HUB ASSEMBLIES

5.1INSPECTION

Ensure the brake shoes (if braked) are clear of the drum with no interference. Clean the hub to remove any road debris.

Rotate the hub slowly – there should be no roughness or restriction.

The wheel bearings are greased on assembly at the factory and should be re-greased at a minimum every 38,624 km (24,000 miles) or 2 years with axle grease “ELF Multi 2” or equivalent.

Use the service interval to inspect the bearings for wear/damage. Replace the seal if necessary, lubricating the lip and bore, not the outside diameter.

Rotate the hub rapidly – There should be no rumble, rattle or high-pitched noises.

Rock the wheel while holding at the top and the bottom to detect essential bearing endplay.The maximum movement should be 2mm, measured at the wheel rim.

If any clearance or free movement appears to emanate from the suspension, check the axle housing for damage.

WHEEL HUB ASSEMBLIES WITH TAPER ROLLER

BEARINGS

In order to re-set, remove the grease cap, split pin and set the slotted nut. See Figure 45.

It is generally accepted that a finger tight slotted nut, will result in a correct setting and running clearance for normal bearing life. Always replace the split pin with a new one when setting is complete and re-fit the grease cap.

Figure 45. Grease Cap, Split Pin

and Slotted Nut Removal

WARNING

It is our experience that the majority of bearing failures are the result of over- tightening of the slotted nut or failure to replace contaminated grease (e.g.: water ingress – especially salt water).

WARNING

It is as important not to OVERPACK the hub with grease, as it is to allow bearings to run dry.

REMOVAL OF HUB/BRAKE DRUM ASSEMBLY

Remove the wheel, grease cap, split pin, slotted nut, and washer and pull the drum off the stub axle.To avoid contamination, take care not to drop the outer bearing cone onto the floor.

5.4WHEEL HUB ASSEMBLIES WITH UNIT BEARINGS

These hubs require no maintenance, however at intervals of 38,624 km (24,000 miles) or 12 months, the wheel hubs should be checked for side play and the complete hub replaced if necessary.

WARNING

When refitting the hub, always fit a new nut and tighten to a torque of 280Nm (206lbf.ft.)

5.5WHEEL NUT / STUD TORQUE SETTINGS

TABLE 9. WHEEL NUT/ STUD TORQUE SETTINGS

Wheel Nuts		Nm			Lbf.ft
	Min.		Max.	Min.		Max.
Wheel Nut 1/2 IN. UNF	70		110	50		80
Wheel Nut 5/8 IN. UNF	135		160	100		120
Wheel Nut M18 X 1.5	245		300	180		220
Wheel Studs
Wheel Stud M12 X 1.5	65		90	50		65
Wheel Stud M14 X 1.5	120		150	90		110

PAGE 46 — MAYCO ST-45HRM CE PUMP — OPERATION & PARTS MANUAL — REV. #0 (02/23/04)