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MAINTENANCE
Mi99-35A
INFORMATION
DATE : October 1999 SECTION : 13
SUBJECT : FRONT AND TAG AXLE
REVISION : A
REFERENCE MANUAL CHANGED FOR GKN PARTS AND SERVICE MANUAL #1604
Important Notice: This maintenance is recommended by Prévost Car to increase your vehicle's
performance. Note that no reimbursement will be awarded for carrying out this maintenance.
APPLICATION
WHEEL HUBS LUBRICATION
Model VIN
H3-41, H3-45 Coaches
Model Year: 1995 - 2000
From 2P9H33495S
1001291 up to now.
DESCRIPTION
Two types of wheel hubs are available. One is lubricated with grease and the other is lubricated with oil.
Oil lubricated wheel hubs are standard while grease lubricated wheel hubs are optional.
PROCEDURE
Warning : Park vehicle safely, apply parking brake, stop engine and set battery master switch(es) to the
OFF position prior to working on the vehicle.
FRONT AND TAG AXLE WHEEL HUBS
Grease Lubricated Wheel Hubs
Front and tag axle wheel hubs and hub bearings need to be cleaned and greased every 50,000 miles (80
000 km) or once a year, whichever comes first.
1. Recommended Lubricants
A good quality lithium-base grease NLGI No. 1 or No. 2 is recommended.
2. Hub Bearing Inspection
An inspection should be made after the first 3,000 miles (4 800 km) and then at intervals of 25,000 miles
(40 000 km). When the wheels are raised, they should revolve quite freely without roughness.
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Hub bearings should have a slight end movement within the limits of 0.0005 to 0.002" (0.0127 to 0.0508
mm) when rocked forward and backwards on axle stub. Refer to GKN AXLES LIMITED “Parts and
Service Manual No. 1604, Issue A", annexed to Section 10 of Maintenance Manual, "FRONT AXLE".
FIGURE 1: GREASE LUBRICATED WHEEL HUB
Oil Lubricated Wheel Hubs
Hub Bearing Maintenance
If applicable, the front and tag axle wheel hubs use oil lubrication that eliminates periodic grease
repacking of the hubs. A sight glass is provided for convenient verification of oil level. Oil level should be
checked daily and must be maintained between the ”ADD” and “FULL” level mark in the sight glass or
between 15/16” and 1 3/16” from wheel centerline (23 to 30 mm). If oil is not visible through the sight
glass, general purpose gear lubricant SAE 85W/140 (API spec. GL5) must be added by removing the oil
fill cap in center of hub to bring oil to the correct level. To check oil level after vehicle has been driven, wait
at least 15 minutes to ensure that oil has settled.
Note: For vehicles equipped with Independent Front Suspension, refer to Section 16 "SUSPENSION".
Caution: Hub oil fill cap is provided with a very small vent hole in its center. Occasionally insert a small
tip (toothpick size) to avoid hole restriction and prevent overpressure in bearing housing.
FIGURE 2: OIL FILL CAP 13017
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