_O & M MANUAL - WEST LANE MOBILE HOME PARK

Home Browse Search

15 For setting end clearances on 2-1/2" thru 5" gear diameter units, special tools, thrust adjuster fork and thrust adjuster saddle are required. Refer to Table 5 for installation of tools. The flat side of the saddle rests against the bearing inner race and the flat side of the fork rests against the back side of the gear. Install a shim, with thickness equal to gear end clearance (Table 5), between the impeller and the gear end headplates. Tap on top of the fork until the shim becomes snug. Remove the shim and check end clearances. To increase gear end clearance, tap on the end of the gear end shaft with a soft metal mallet. Set end clearances for 6" & 7" by turning capscrews (31) evenly in or out. 16. Install drive end cover (5) after packing bearing cavities with suitable grease. Replace drive shaft seal. Lip must point toward (33) the bearing. Exercise care not to damage the lip as it passes over shaft keyway. 17. Install gasket item (7). Install the gear house after cleaning out the inside. Tighten gear box cap screws (23) evenly. Fill with correct grade of oil until oil flows out through oil level hole. Grease drive and bearings. (See Lubrication.) 18. Reinstall coupling or belt sheave making sure that they have a slight slide fit with the shaft and could be installed by hand. TECHNICAL SUPPLEMENT for 32, 33, 36, 42, 45, 47, 53, 56, 59, 65, 68, 615 UNIVERAL RAI® -G BLOWERS ROOTS' Universal RAI --G rotary positive gas blowers are a design extension of the basic Universal RAI - blower model. URAI--G blower uses (4) mechanical seals in place of the standard in board lip seals to minimize gas leakage into the atmosphere. The seal vent chambers are plugged. These units are intended for gases which are compatible with cast iron case material, steel shafts, 300/400 series stainless steel and carbon seal components, viton o -rings and the oil/grease lubricants. If there are any questions regarding application or operation of this gas blower, please contact factory. Precaution: URAI"'-G blowers: Care must be used when opening the head plate seal vent chamber plugs (43) as some gas will escape—if it is a pres- sure system, or the atmospheric air will leak in -if the system is under vacuum. There is a possibility of some gas leakage through the mechanical seals. This leakage on the gear end will escape through the gear box vent, and on the drive end, through the grease release fittings. If the gas leakage is undesirable, each seal chamber must be purged with an inert gas through one purge gas hole (43 ) per seal. There are two plugged purge gas holes(1/8 NPT) provided per seal. The purge gas pressure must be maintained one psi above the 13 discharge gas pressure. Also, there exists a possibility of gear end oil and drive end grease leakage into the gas stream. The lubricants selected must be compatible with the gas. Mechanical Seal Replacement: Disassemble the blower. During disassembly, damage to mechanical seals is very likely. During rebuild, always use new mechanical seals. Prior to any assembly, make sure that all parts are completely clean and free from nicks and scratches. (1) Place head plate on an assembly table with seal bores pointing up. Coat the OD of the stationary seal element and install it with carbon facing up in the seal bore with a seal driver that is guided by the bearing bore. Drive the seal flush with front face of the seal bore. Repeat this procedure for all four seals. Apply a light coating of lubricating oil on the sealing surface. Protect sealing faces during assembly from any damage. (2) Apply teflon based sealant on the cylinder flanges before installing head plates. Continue the assembly procedure as outlined up to bearing installation. Before installation of the bearings, the seal mating rings need to be installed. Apply light film of lubricating oil on mating ring o -rings and sealing faces. Slide mating rings on the shaft and up to carbon faces making sure that no damage to the o -rings occur during installation (break sharp shaft corners to avoid damage to the o -rings during initial preparation). Install bearings all the way against the back bearing bore shoulders. (3) Complete the rest of the assembly.Make sure all plugged holes are sealed with teflon thread liquid sealant. Note: On 6" gear diameter units, shims (44) are used between the bearing clamp plates and the head plate on the gear end. Also, on size 32 and 42, washers with embedded o -rings are used on the center head plate to cylinder bolts. After the assembly is completed, plug the blower inlet and discharge connections and run static soap bubble. Leak test to assure leak free assembly. For satisfactory operation of mechanical seals, synthetic lubricants are recommended (Check suitability to gases before using.) Oils: (1) ROOTS- GT Synthetic Lubricant ROOTS P/N 13-106-001 (1) one quart ISO -220 (2) Mobil SHC 600 Series Lubricating Oils Grease: ROOTS' Synthetic Grease — NLGI # 2 ROOTS P/N T20-019-001 (1) one 14 oz tube 02002 Dresser, Inc. all rights reserved. ROOTS, RAM, URAI and WHISPAIR are trademarks of Dresser, Inc.