7
MN16022
MAINTENANCE
Check oil levels and oil quality regularly. Change oil at the
intervals specified in the Lubricants section of this document.
Check alignments of drive components regularly. Check chain
and belt tensions and hardware tightness periodically too.
ASSEMBLY/DISASSEMBLY HELICAL BEVEL
REDUCER (RHB)
Please follow the instructions outlined below when assembling
and disassembling this unit. Failure to follow the instructions as
outlined may result in damage to the gear unit or to the machine’s
drive shaft. For ease of assembly, it is recommended that the
machine’s drive shaft be chamfered. DO NOT HAMMER THE
GEARBOX SHAFT ONTO THE MACHINE’S DRIVE SHAFT.
The machine’s drive shaft should be produced in accordance
with the dimensions shown on the accompanying Table 5 or 6.
ASSEMBLY
All shaft mounted gearboxes are furnished with A) Retaining
Ring, B) Keep plate, C) Retaining Bolt, D) Spring Washer, E) Dust
Cap and Anti-Seize as shown in the finished assembly, Figure
4. Apply the anti-seize onto the customer shaft before installing
reducer onto the shaft. The gearbox is pulled onto the shaft by
means of a threaded rod and nut assembly as shown in Figure
3 below. The threaded rod and spacer are not supplied. The
threaded rod (M) is specified in Table 5 or 6. After the gearbox
has been pulled completely onto the machine shaft firmly against
the machine shaft’s backing shoulder, it must be locked in place
with the retaining bolt tightened to the tightening torque shown in
Table 4.
DISASSEMBLY
Prior to disassembly, the dust cap, retaining bolt, spring washer,
keeper plate and retaining ring must be removed. For ease of
disassembly, it is recommended that the following tools be made
and used as described: The round keyed nut (A) is inserted into
the free space between the retaining ring in the gear unit’s hollow
shaft and the end of the machine’s drive shaft. The removal
bolt (B) is screwed into the nut (A) which presses a disk (C)
against the machine’s drive shaft. The resulting force pushes the
gearbox off of the machine’s drive shaft. Reference Figure 5 for
the disassembly arrangement.
NOTE: The retaining bolt supplied with the gear unit cannot be used
for this purpose and must be replaced with the bolt specified in Table
5 or 6. The round keyed nut and disk should be made from 1045 steel
and removal bolt should be a minimum of SAE Grade 5.
Table 4 - Tightening Torques for Retaining Bolt
Recommended Tightening Torque for Retaining Bolt
Unit Size
Bolt Thread Size (M)
Torque
B38
3/8–16
236 in-lb
M10
42 N-m
B48
3/8–16
236 in-lb
M12
73 N-m
SPACER
NUT
THREADED ROD
Machine’s Drive Shaft
Backing Shoulder
Figure 3 - Threaded Rod and Nut Assembly
B
C
D
E
A
Figure 4 - Finished Assembly
B
A
U
C
M4
M4
VG
Figure 5 - Disassembly Arrangement
