RAM K5UR120ML-AM1G Series, Instructions, Parts And Maintenance Manual

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ASSEMBLY OF WHEEL DRIVE
Refer to Parts Illustration
STEP 1
Press new bearing cups (7 & 10) in each side of the hub (9). It is recommended that bearing cups (7 &
10) and cones (6 & 12) be replaced in sets.
STEP 2
Assemble bearing cone (6) into cup (7) at seal end of hub (9) and press a new seal (5) into hub (9).
Install boot seal (4) on hub (9) if unit is so equipped.
STEP 3
Position spindle (3) upright on bench. Lubricate lips of seal (4) and (5) and lower hub (9) onto spindle
(3). Hub (9) should be centered as it is lowered over spindle (3) to prevent seal damage.
STEP 4
Assemble bearing cone (11) over spindle (3). Press bearing cone (11) over spindle bearing journal
using press and cylindrical bearing cone driver 598F. Pressure bearing cone (11) down until rollers just
touch cup (10). Take care to avoid pressuring cone (11) too far. Note: If a press is not available, place
tool 598F over splined end of spindle (3) on the edge of bearing cone (11) and drive into place with
hammer or mallet. If this method is used, care must be taken to avoid damage to bearing cone and
spindle.
STEP 5
Install thrust washer (12) and bearing nut (14). DO NOT install lock washer (13) at this time.
STEP 6
Place spindle drive tool, 598F, over spindle (3) and bolt or pin to hub (9).
STEP 7
Check initial rolling torque by installing a lb.-in. torque wrench (arm or dial type) on center nut of spindle
drive tool and turning hub (9) slowly and steadily with the torque wrench. Note mean torque. An initial
bearing torque of greater than 52-lb. –in. with boot seal installed or 48 lb. –in. without boot seal means
that the cone (11) was pressed on too tightly in step 4. In this case, back off bearing cone (11) by
pressing spindle (3) out of cone (11) until initial preload is relieved. See step 11 of disassembly
procedure.
STEP 8
Torque bearing nut (14) with bearing nut wrench 593RR until a bearing rolling torque of 44 – 52 lb. –
in., with a boot seal installed, or 40 – 48 lb. –in., without a boot seal, is reached. This may require
several trials of pressing the cone (11) by torquing the nut (14) and then checking the rolling torque.
Rotate hub (9) by hand as nut is being tightened in order to seat bearings. Note: Up to 250 lb. –ft. of
torque may have to be applied to bearing nut (14) in order to press cone (11) into position.
STEP 9
Remove bearing nut (14) and install lock washer (13). Replace bearing nut (14).
STEP 10
Re-torque bearing nut (14) to 65-75lb. – ft. (88 – 100 Nm).