Each Amarillo Gear Company parallel shaft gear drive is designed and manufactured specifically for the demanding environment of dry cooling systems and air cooled condensers. As with any precision machine component, proper selection, installation, maintenance, and operating procedures are imperative for long life and trouble-free service. Our engineers will be pleased to assist when unusual conditions require special procedures or options.
The parallel shaft gear drives Amarillo Gear Company produces for dry cooling systems and air cooled condensers reflect a long history of quality workmanship and reliability. Amarillo Gear has been designing and manufacturing right angle drives since 1934, and our commitment to excellence continues today. One example of this commitment is the availability of complete noise and vibration testing, all with data taken under full horsepower loading up to 500 hp.
Amarillo Gear Drives are also made available for, and are commonly used with many other applications. The basic design and inherent ruggedness of Amarillo Gear drive is adaptable to many types of vertical machines such as agitators, mixers, dryers, and separators. Design features and ratings are in accordance with, or exceed, the minimum requirements of AGMA (American Gear Manufacturers Association) and CTI (Cooling Technology Institute) standards.
All ratios are reducing and defined as the ratio of input speed to output speed. Consult your catalog for nominal reduction ratios. Exact ratios are also provided.
The required ratio is established by dividing the input or driver speed by the output or fan speed. From the catalog, select the ratio from either Table I or II that is the closest to the required ratio. Select the model that has a service rating listed under the required ratio column that is equal to or greater than the power rating of the driver at the input speed. When the gear drives are to be selected using a service factor other than 2.0, multiply the “service rating” from the catalog tables by 2.0 to calculate the “mechanical rating.” The “mechanical rating” is then divided by the appropriate service factor to obtain the new “service rating” at the required conditions.
Amarillo Gear Company recommends a minimum service factor of 2.0 for gear drives in cooling tower fan service when driven by electric motors. All ratings shown in the catalog under Tables I & II are service ratings and include a 2.0 service factor as also recommended under AGMA standards. Ratings are listed for both 60 and 50 cycle electric motor speeds. Ratings at intermediate speeds may be interpolated from the tables. Please contact the factory when driver speeds exceed 1,800 rpm.
The Amarillo Gear parallel shaft gear drive is specifically designed for dry cooling and steam condenser service. During design, Amarillo Gear engineers ensured that the thermal ratings equal or exceed the service ratings listed in Tables I & II of the catalog when the ambient air temperature is 120° F or less. Contact the factory for a thermal rating when the air temperature exceeds 120° F.
Normal rotation is both shafts turning clockwise, when viewed from the top, as shown in the illustration below. Occasional use with both shafts rotating counterclockwise is permissible except when equipped with our optional non-reverse backstop. Special bearing arrangements are used when the primary direction of rotation is counterclockwise, and the gear drives should be ordered accordingly.
Castings are rigidly designed using finite element analysis, and constructed to absorb internal and external loads with minimum deflection. Doweled gear case and cover assures permanent alignment of bearings and gears under load. The sloped floor of the gear case adds rigidity and permits complete drainage of oil. All casting materials are gray iron for effective damping of noise and vibration. All mating castings are sealed using “formed-in-place” gasket material which eliminates “weeping” associated with fiber-type gaskets. Each model has mounting provisions for easy installation of three accelerometers for vibration monitoring of each shaft. Mounting feet are pre-drilled with pilot holes to assist in installation of dowel pins.
Helical gears are designed and manufactured specifically for fan drive service and are machined from nickel alloy steel, case hardened, and precision ground to provide low noise and vibration operation.
Quiet operation of the parallel shaft gear drive is achieved through careful design and controlled manufacturing methods of components. Our engineers understand all of the many parameters that effect gear noise and have applied the latest research to the design of the parallel shaft gear drive. Precisely machined, ground gear teeth are crowned with the ideal amount of tip and root relief to ensure quiet operation. Rigid shafts are permanently aligned within their housings to guarantee precise alignment of the gears under load. Test results collected in our state-of-the-art test facility support that our sound levels are the lowest available in the industry.
All bearings are roller type and provided by major manufacturers. The fan shaft thrust bearing is designed to carry all loads imposed by the fan while maintaining 100,000 hours L10 life. All bearings are sized to meet or exceed the minimum life requirements of AGMA and CTI.
Alloy steel output shafts are sized to provide a rugged spindle for the fan. Surfaces for gears, bearings, input coupling, and fan hub are precision ground.
The input shaft opening has dual spring-loaded, single-lip seals to keep outside contamination from entering the gearbox. The fan shaft is sealed using dry well construction with isolation protection using a lip seal. Amarillo Gear Company was an early pioneer in the use and perfection of this unique sealing arrangement which provides maximum protection against vertical shaft leakage.
Reverse rotation of the fan is prevented by addition of the optional pin and ratchet non-reverse backstop to the fan drive. This proprietary, reliable, no-maintenance backstop, has been successfully used on Amarillo Gear products for over 60 years. This external device can be ordered on new fan drives or installed easily on existing fan drives in the field.
A positive displacement oil pump, driven by the input shaft, provides adequate lubrication in either direction at any speed. The oil pump is protected between the front mounting feet to prevent accidental damage during handling. The grease line for the thrust bearing is internal to the gear case with an easily accessible grease fitting located on top of the gear drive. A dip stick and permanently mounted oil sight level gauge are provided on all gearboxes to provide accurate determination of oil level.
A large inspection plate cover is easily removed for periodic inspections. Ports for oil fill, oil drain, and venting are tapped and located for installation of remote service piping when desired.
Special shaft extensions, non-reverse backstop (anti-wind milling), lubricating oil heaters, oil temperature gauge, oil level switch, and other accessory items are available on special order.
Amarillo Gear Company LLC (“Amarillo”) warrants that the Amarillo Parallel Shaft Gear Drive (“Product”) will be free from defects in material and workmanship for a period ending on the earlier to occur of twelve months from the date of installation or eighteen months from date of shipment from Amarillo’s factory.
This Limited Warranty shall be void if the Product is not installed, operated, serviced and maintained in accordance with Amarillo’s published instructions for the Product or if transmitted loads are not within the published limits for the Product. In addition, this Limited Warranty shall be void if the Product is in any way subjected to: (i) improper storage; (ii) accident, damage, abuse or misuse; (iii) abnormal operating conditions or applications; or (iv) repair or modification by Buyer or any third party without the prior written consent of Amarillo.
With respect to any defect in material or workmanship covered by this Limited Warranty, if Buyer notifies Amarillo of such defect in writing within the warranty period, Amarillo will repair or replace, at its sole option, any such defective Product or part. This shall be Buyer’s exclusive remedy. Any claims not made within the warranty period are deemed waived by Buyer. Before returning any Product or part hereunder, Buyer must contact Amarillo for a Return Goods Authorization number and to arrange for transportation. Amarillo will not pay any transportation costs incurred without its prior approval.
In no event will Amarillo be liable, whether in tort, contract or otherwise, for any bodily injury, death or property damage resulting from or in any way arising out of any goods or services provided by Amarillo or their sale, use or manufacture. Amarillo shall be not liable for any costs for removal or re-installation of the Product. IN NO EVENT SHALL AMARILLO BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES, LOSSES, OR EXPENSES.
No change in any provision in this Limited Warranty may be made without the prior written agreement of an authorized officer of Amarillo.
THIS IS AMARILLO’S ONLY WARRANTY. AMARILLO MAKES NO OTHER WARRANTY OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED. ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR ANY PARTICULAR PURPOSE ARE HEREBY DISCLAIMED AND EXCLUDED BY AMARILLO.
Motor Mount Dimensions (Inch)
Frame Size |
XAJ |
XAK |
XBD |
XBF |
XN |
365TSC |
11 |
12.5 |
14 |
11/16 |
"A" + 3.75 |
405TSC |
11 |
12.5 |
14 |
11/16 |
"A" + 4.25 |
444TSC |
14 |
16 |
18 |
11/16 |
"A" + 4.75 |
445TSC |
14 |
16 |
18 |
11/16 |
"A" + 4.75 |
447TSC |
14 |
16 |
18 |
11/16 |
"A" + 4.75 |
449TSC |
14 |
16 |
18 |
11/16 |
"A" + 4.75 |
405TC |
11 |
12.5 |
14 |
11/16 |
"A" + 7.25 |
444TC |
14 |
16 |
18 |
11/16 |
"A" + 8.50 |
445TC |
14 |
16 |
18 |
11/16 |
"A" + 8.50 |
447TC |
14 |
16 |
18 |
11/16 |
"A" + 8.50 |
449TC |
14 |
16 |
18 |
11/16 |
"A" + 8.50 |
Gearbox Dimensions (Inch)
Model |
A |
B |
C |
D1 |
E |
F STD |
F-Ext. Brg. Housing |
G |
H |
J |
K |
L |
M2 |
N |
O |
P2175 |
28.75 |
25.25 |
3.75 |
Note 1 |
1.8740 |
4.1240 |
3.9990 |
21.25 |
32.00 |
1.88 |
1/2 x 1/4 |
1 x 1/2 |
39.00 |
1 5/16 |
1.88 |
P2195 |
30.50 |
27.25 |
4.25 |
Note 1 |
2.2490 |
4.6240 |
4.4990 |
23.25 |
34.31 |
1.88 |
1/2 x 1/4 |
1 1/4 x 5/8 |
42.25 |
1 5/16 |
1.88 |
P2225 |
33.75 |
30.50 |
5.00 |
Note 1 |
2.9360 |
5.4990 |
5.3740 |
26.25 |
38.75 |
2.13 |
3/4 x 3/8 |
1 1/4 x 5/8 |
47.00 |
1 9/16 |
2.13 |
Model |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
AB |
AC |
AD |
AE |
Weight (LB) |
P2175 |
3/4 |
1 |
1/2 |
9.00 |
4.00 |
5.00 |
16.75 |
8.00 |
17.625 |
9.00 |
4.00 |
10.75 |
29.50 |
18.00 |
9.13 |
1600 |
P2195 |
3/4 |
1 |
1/2 |
9.25 |
4.50 |
5.38 |
18.75 |
8.00 |
19.625 |
9.75 |
4.50 |
11.75 |
30.63 |
19.50 |
9.75 |
2200 |
P2225 |
3/4 |
1 |
1/2 |
9.75 |
5.00 |
6.00 |
20.75 |
9.00 |
22.688 |
11.50 |
5.00 |
13.00 |
35.00 |
23.00 |
11.25 |
3800 |
NOTES:
1.To suit customer specifications. For "D" lengths exceeding 30", the extended bearing housing is required.
2. For XBD = 18".
3. All dimensions in inches. Contact factory for metric dimension prints.
