Howden Roots RAS Whispair, Инструкция по установке, эксплуатации и обслуживанию

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ILRB-3000 GEA20261
RAS and RAS-J WHISPAIR Blowers
Page 18 of 33
are subject to deterioration as well as wear and may require replacement at varying periods. O-rings should be replaced at each
disassembly.
Troubleshooting and Repairs
Refer to the TROUBLESHOOTING CHECKLIST for a wide range of causes and solutions for operating troubles. Suggested
remedies can typically be performed by qualified mechanics, using procedures detailed in this manual.
Major repairs not covered in this manual are considered beyond the scope of maintenance, and should be performed by
Howden Roots personnel. Refer to the nearest Howden Roots sales office as listed on the last page of this manual. Do not
attempt to repair failures covered by warranty, unless specific approval has been obtained through a Howden Roots sales office
before starting the work. Unauthorized disassembly within the warranty period may void the warranty.
When repairs involve parts replacement, factory parts should be used to ensure fit and suitability. Keeping spare parts on hand
can help reduce delays associated with repairs. Remember to supply all information from the blower nameplate when ordering
parts.
Repair and Adjustment Procedures - Some operations involve extra care and a degree of precision work. This is especially true
of the procedures for timing impellers and handling bearings. Experience indicates that a high percentage of bearing failure is
caused by dirt contamination before or during assembly. Therefore, clean the work area before starting disassembly, and
protect new or reusable parts as work progresses.
The following detailed work procedures describe repairs and adjustments that can typically be handled successfully at the
installation site. While reading the instructions, refer to the item numbers (shown in parentheses) on the related sectional
assembly drawings and in Table 9.
A - Removing Gears with Gear Locking Assemblies
1. Drain the oil using the plug (67) near the bottom of the gearbox (3).
2. Loosen the cap screws (30) that attach the gearbox to the headplate.
3. Attach the lifting device to support the gearbox and remove the cap screws. Move the gearbox out of the way.
4. Make match marks on the gears so that they can be returned
to the same shafts in the same position.
5. Gradually and evenly release the gear locking assembly cap
screws all around. Initially, each screw should be released about
a quarter of a turn to prevent tilting and jamming of collars.
Loosen the locking assembly so that both collars are loose on
the tapered inner rings. To loosen the back collar, you may need
to tap on the locking screws. To loosen the front collar, you may
need to use wedges between the collar and the gear web.
Warning: Do not remove the locking screws completely or the collar may spring off and cause injury.
6. Pull the gears off the shafts using the two puller holes in the gear (see Table 6 for size information).
ILRB-3000 GEA20261 RAS and RAS-J WHISPAIR Blowers.pdf 18 03/09/2015 13:21:27