PPI STATIC SHAFT PULLEY

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These recommendations are a guideline for typical conveyor applications. They do not overrule bearing or greasing manufacturer’s

recommendations.

PPI recommends a high-quality, #2 Lithium Complex based mineral oil grease with a viscosity of 200 to 250. Mobilgrease XHP222 is

suggested to be used on conveyor pulley applications, including the SSP. When used with an automatic greasing system, a #1 Lithium

Complex grease is recommended, such as Mobilgrease XHP221 This is compatible with the initial grease fill. For ambient temperatures from

-40°F to 0°F (-40°C to -18°C), it is recommended that a Lithium Complex based synthetic oil grease is used, such as Mobilith SHC220.

Suggested greasing intervals during initial use are as follows:

Check the grease condition for excessive oiliness or dirt and adjust

greasing frequency accordingly. For conditions and/or temperatures

outside of this range, consult with a reputable lubricant supplier.

PPI grease fills conveyor pulley bearings 100% at the factory. This

reduces the possibility of condensation in the housing. This is the

preferred method for larger, slower speed bearings such as those

used on pulleys. Therefore, some grease may be purged out during

the first run of the pulley. This is considered normal. After 8 hours of

initial use, all bearings should be re-greased with fresh grease.

Precision Pulley & Idler cannot be held responsible for performance of individual batches of grease. Changes in lubricant specifications, performance, and

lubricant guarantees are the responsibility of the lubricant manufacturer.

Warranties shall not apply to any product that has been subject to misuse, misapplication, neglect (including but not limited to improper maintenance and

storage), accident, improper installation, modification (including but not limited to use of unauthorized parts or attachments) adjustment, repair, or lubrication.

Misuse also includes, without implied limitation, deterioration in the product or part caused by chemical action, wear caused by the presence of abrasive

materials, and the improper lubrication. Identifiable items manufactured by others but installed in or affixed to our products are not warranted by us, but bear

only those warranties, express or implied, given by the manufacturer of that item, if any.

Responsibility for system design to ensure proper use and application of Precision Pulley & Idler products within their published specifications and ratings

rest solely with the customer. This includes without implied limitation analysis of loads created by vibrations within the entire system regardless of how

induced.

SECTION 1 – GREASING RECOMMENDATIONS

OPERATION & MAINTENANCE

STATIC SHAFT PULLEY (SSP

)

SUGGESTED GREASING INTERVALS

Conditions

up to 120°F

(up to 50°C)

120° to 200°F

(50° to 90° C)

Clean 2 to 6 months 1 to 2 months

Moderate Monthly 1 to 4 weeks

Dirty Weekly 1 to 7 days

Extremely Dirty Daily Every Shift

Turnover Pulleys Daily to Weekly Every Shift

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The Static Shaft Pulley (SSP®) is a conveyor pulley designed for various industrial applications, with a focus on durability and ease of maintenance. It features a static shaft design, meaning the shaft remains stationary while the pulley shell rotates around it, supported by internal bearings.

Function Description:

The SSP serves as a critical component in conveyor systems, facilitating the movement of conveyor belts. Its primary function is to provide a rotating surface that drives or redirects the belt, ensuring smooth and continuous material transport. The static shaft design aims to simplify maintenance and potentially extend bearing life by isolating the bearings from rotational stresses on the shaft itself.

Important Technical Specifications:

Grease Type: PPI recommends a high-quality, #2 Lithium Complex based mineral oil grease with a viscosity of 200 to 250. For automatic greasing systems, a #1 Lithium Complex grease is recommended. For ambient temperatures from -40°F to 0°F (-40°C to -18°C), a Lithium Complex based synthetic oil grease (e.g., Mobilith SHC220) is recommended.
Bearing Fill: Bearings are 100% grease-filled at the factory to reduce condensation.
Seal Carrier: Features two 1/4" UNC bolt holes for removal aid and one 1/8" NPT pipe fitting for greasing.
Seals: The SSP utilizes multiple seals, including:
- Contact Seals: V-ring contact seals (e.g., V-110A to V-725A) with varying nominal diameters (Max. Dia. 4.528 to 29.331, Min. Dia. 4.134 to 27.756) and SSP sizes (015 to 284).
- Interior Contact Seals: Oil seals (e.g., 34454TA-H to 460x500x20SA) with ODs from 4.50 to 19.68 and IDs from 3.44 to 18.11, corresponding to SSP sizes 015 to 284.
- O-Ring Seals: O-ring cord (1/8" diameter) and sponge rubber cord (3/8" and 1/2" diameters for Rev 0 housings).
Retainers:
- Shaft Retainers (External): Ranging from 2.952" to 16.535" nominal diameter, with corresponding IDs and ODs, for SSP sizes 015 to 284.
- Bearing Retainers (Internal): Ranging from 5.250" to 29.921" nominal diameter, with corresponding IDs and ODs, for SSP sizes 015 to 284.
Bearing Assembly Components: Hub kits, bearing kits, and seal kits are available for various SSP series (SSP015 to SSP284), specifying bearing size, bore (mm and in), shaft diameter at extension, and corresponding part numbers.
Mounting Bolts: Capscrews and washers are used for mounting, with quantities and sizes varying by SSP size (e.g., 4 @ 5/8-11 UNRC x 2 1/2 for SSP015, 24 @ 1-1/4-6 UNC x 6 for SSP284). Torque specifications range from 150 to 1,000 ft-lbs.
Temperature Sensor (Optional): A thermal sensor with leadwires can be attached to measure bearing temperature. Resistance readings can be translated to temperature, and a transmitter can be used for customized output. Errors due to long lead wires can be calculated using provided equations (R = L x N, E = R/T).

Usage Features:

Greasing: The seal carrier includes a grease zerk for bearing lubrication. Remote grease lines are recommended for safe regreasing while the pulley is rotating. Greasing should continue until purging around the seal carrier is noticed.
Optional Greasing Method: An optional method involves greasing with a specified volume of grease (1.4 oz for SSP015 to 116 oz for SSP284) to purge old grease through the v-ring contact seals and seal carrier.
Initial Use: After 8 hours of initial use, all bearings should be re-greased with fresh grease.
Temperature Monitoring: Optional temperature sensors allow for continuous monitoring of bearing temperatures, aiding in preventive maintenance.

Maintenance Features:

Greasing Intervals: Suggested greasing intervals vary based on operating conditions and temperature:
- Up to 120°F (up to 50°C):
  - Clean: 2 to 6 months
  - Moderate: Monthly
  - Dirty: Weekly
  - Extremely Dirty: Daily
  - Turnover Pulleys: Daily to Weekly
- 120° to 200°F (50° to 90°C):
  - Clean: 1 to 2 months
  - Moderate: 1 to 4 weeks
  - Dirty: 1 to 7 days
  - Extremely Dirty: Every Shift
  - Turnover Pulleys: Every Shift
- Greasing frequency should be adjusted based on grease condition (excessive oiliness or dirt).
Bearing Removal:
- Clean exterior surfaces of the shaft and surrounding areas.
- Loosen/remove locking bolts on the mounting block and remove the block from the shaft.
- Loosen setscrews holding the seal carrier to the shaft.
- Remove the seal carrier using removal holes (threading 1/4" UNC bolts) or by prying with screwdrivers.
- Remove the retainer ring holding the bearing to the shaft (fixed end) by spiraling it off with screwdrivers.
- Remove mounting bolts and thread into backout holes to pull the bearing housing out of the pulley.
- Remove the retainer ring holding the bearing in the housing.
- Press out the bearing and rear seal.
Seal Carrier Rebuilding:
- Replace the two O-rings on the ID of the carrier (Seal 1), using 1/8" diameter O-ring cord, slightly longer than the groove. Caulking can be used to hold O-rings in place.
- Replace the V-ring seal (Seal 3), ensuring the lip faces the bearing.
- Replace the outer V-ring seal or taconite seal (Seal 4), ensuring the lip faces the bearing.
Grease Channel Maintenance:
- Remove the old grease channel, clean out grease, and inspect for damage.
- Press in a new grease channel (3/8" x 3/8" or 1/2" x 1/2" cross-section), ensuring the 1/8" groove faces down or into the key slot.
- Sand the top of the plastic channel to match the shaft radius for a tight fit.
- If a retainer ring is used, cut a groove in the grease channel to match the retainer groove in the shaft before re-installing the bearing.
Reassembly: Reverse the disassembly steps. Ensure the seal carrier's bevel edge is flush with the bearing housing.
Kits: Hub kits, bearing kits, and seal kits are available, including standard and taconite contact seals, and fixed/free retainer setups.