Ingersoll Rand literature · Installation & maintenance manual
Ingersoll Rand Series ST900 (ST950 / ST999) Turbine Air Starter Installation and Maintenance Manual (P7156)
This is the Ingersoll Rand installation and maintenance manual for the Series ST900 turbine-powered air starter, covering the ST950 and ST999 models with pre-engaged or inertia drives and B, C or D gear ratios. It is intended for installers and service technicians on off-highway, marine and stationary engines running on air or natural gas, and notes that the ST900 is built for long, heavy-duty cranking. It explains operating limits, installation and orientation, mounting dimensions, piping layouts and the model code, then provides illustrated parts lists with kits, a lube and torque drawing, overhaul steps, a turbine module change-out procedure, bench tests and troubleshooting.
Document at a Glance
- Publisher
- Ingersoll Rand
- Document type
- Installation & maintenance manual
- Form / number
- Form P7156, No. 03540598, Edition 12, September 2010
- Language
- English
- Pages
- 28
- File
- PDF, 3.5 MB
What's in This Document
| Section | Pages | What it covers |
|---|---|---|
| Product Safety Information and Operating Guidelines | 2 | Intended use, pressure and cranking-time limits, strainer requirement and natural gas exhaust venting. |
| Installation (General Information, Orientation, Mounting, Barring Over the Engine) | 2-3 | Hose and supply-line sizing, strainers, sealing, reorienting the drive housing and inlet, step-by-step mounting with controls, and barring the engine by hand. |
| Mounting Dimensions (Pre-Engaged, D Ratio Pre-Engaged and Inertia) | 4-5 | Dimensional drawings with flange, pilot, inlet, exhaust and drive-housing orientation options, model coding and starter weights. |
| Piping Diagrams | 5-6 | Engine prelube and multiple-starter layouts for high pressure supplies with the Ingersoll Rand part number of each component. |
| How to Order a Starter (Model Coding and Pinion Data) | 6-7 | Model-code breakdown with gear ratio and drive letters, exhaust type, maximum supply pressure per model and pinion data. |
| Sectional and Exploded Diagrams and Parts Lists (Pre-Engaged and Inertia) | 8-14 | Illustrated views and item-by-item part numbers for pre-engaged and inertia ST900 starters, with model variants, gear, seal and tune-up kits. |
| ST900 Lube and Torque Specifications; Lubrication and Disassembly | 15-18 | Lube and torque drawing, greases and fluids by drive type, general teardown rules and disassembly of the exhaust elbow, motor, gearing and drive housing. |
| Assembly | 18-21 | Rebuild of the gear case, drive housing, idler gear frame, intermediate gear case, motor and directional exhaust cover with torques and fluid quantities. |
| Turbine Module Change-Out | 21-22 | Swapping the complete turbine module on starters with or without the directional housing exhaust, then cleaning the supply line and relubricating the rear turbine bearing. |
| Test and Inspection Procedure | 22-23 | Bench checks for clutch ratcheting, motor action, seal leakage, rotation, drive function, concentricity and pinion engagement travel. |
| Troubleshooting Guide | 23 | Symptoms such as no run, power loss, drive not engaging and oil or air leakage, with probable causes and remedies. |
| Parts and Maintenance | 24 | Notes on genuine replacement parts, authorized repair and recycling at end of life. |
Key Specifications and Data
| Item | Value | Page |
|---|---|---|
| Maximum supply pressure, ST950 models | 150 psig (1034 kPa) | 7 |
| Maximum supply pressure, ST999 models | 90 psig (621 kPa) | 7 |
| Control port operating pressure (pre-engaged) | 70 to 150 psig (483 to 1034 kPa) | 4 |
| Gear set ratios | B = 2.18:1, C = 2.53:1, D = 3.44:1 | 7 |
| Starter weight, pre-engaged (without inlet flange) | 69 lb (31.3 kg) | 4 |
| Starter weight, D ratio pre-engaged | 98 lb (44.5 kg) | 4 |
| Starter weight, inertia | 68 lb (30.8 kg) | 5 |
| Cranking limit | 30 seconds of cranking, then 2-1/2 minutes cool-down before the next attempt | 2 |
| Supply line size | 1-1/2 in hose or pipe up to 15 ft; 2 in over 15 ft | 2 |
| Inlet strainer filtration | 300 mesh, 40 micron | 2 |
| Inlet flange | 1.50 in Type J518C flange, Standard Inlet Flange Kit ST700-K166 | 4 |
| Starter mounting bolt torque | 100 ft-lb (136 Nm) | 3 |
| Drive housing cap screw torque | 28 ft-lb (38 Nm) | 2 |
| Motor housing cover cap screw torque | 60 ft-lb (81.4 Nm) | 3 |
| Intermediate pinion retaining screw torque | 90 ft-lb (122 Nm) | 20 |
| Drive pinion retaining screw torque | 80 ft-lb (108.5 Nm) for B and C ratio; 125 ft-lb (169.5 Nm) for D ratio | 19 |
| Directional housing exhaust cover cap screw torque | 55 ft-lb (74.5 Nm) in 20 ft-lb (27 Nm) steps | 21 |
| Gearing oil fill | 175 ml (about 1/3 pint) Dexron II automatic transmission fluid through the side plug hole, plus 15 ml at the exhaust pipe plug hole | 16 |
| Drive gear grease | 8 oz (240 ml) Ingersoll Rand No. 130 Grease | 16 |
| Minimum pressure to engage pinion when barring (pre-engaged) | 70 psig (4.8 bar / 483 kPa) to the IN port | 3 |
Models, maximum supply pressure and drive pinion data (How to Order a Starter)
| Model | Max. supply psig/kPa | No. of teeth | D.P. | P.D. | P.A. |
|---|---|---|---|---|---|
| ST950BP03R31 | 150/1034 | 12/12 | 6/8 | 2.00" | 20° |
| ST950BP03L32 | 150/1034 | 12/12 | 6/8 | 2.00" | 20° |
| ST950CPJ3R493 | 150/1034 | 15 | 4.0 MOD | 2.00" | 20° |
| ST950CP03R25 | 150/1034 | 11/12 | 6/8 | 2.00" | 20° |
| ST950CP03L26 | 150/1034 | 11/12 | 6/8 | 2.00" | 20° |
| ST999BP03L31 | 90/621 | 12/12 | 6/8 | 2.00" | 20° |
| ST999BP03L32 | 90/621 | 12/12 | 6/8 | 2.00" | 20° |
| ST999CP03R25 | 90/621 | 11/12 | 6/8 | 2.00" | 20° |
| ST999CP03L26 | 90/621 | 11/12 | 6/8 | 2.00" | 20° |
| ST950DP09R51 | 150/1034 | 15 | 6/8 | 2.00" | 20° |
| ST950DP09L52 | 150/1034 | 15 | 6/8 | 2.00" | 20° |
| ST999DP09R51 | 90/621 | 15 | 6/8 | 2.00" | 20° |
| ST999DP09L52 | 90/621 | 15 | 6/8 | 2.00" | 20° |
Inlet line strainers and replacement elements
| Line size | Strainer | Replacement element |
|---|---|---|
| 1-1/2 in | ST900-267-24 | ST900-266-24 |
| 2 in | ST900-267-32 | ST900-266-32 |
| 4 in | ST900-267-64 | ST900-266-64 |
Models Covered
Model codes as printed in the document. Linked codes go to the matching Ingersoll Rand starter in our catalog.
ST950BP03R31 ST950BP03L32 ST950CP03R25 ST950CP03L26 ST950CPJ3R493 ST950DP09R51 ST950DP09L52 ST999BP03R31 ST999BP03L31 ST999BP03L32 ST999CP03R25 ST999CP03L26 ST999DP09R51 ST999DP09L52 ST950GCDPJ3R493 ST950B103R31 ST950B103L32 ST999B103R31 ST999B103L32 ST950 ST999
Service Kits and Part Numbers
| Part number | Description | Page |
|---|---|---|
| ST700-K166 | Inlet flange kit (inlet flange, O-ring, mounting bolts and lock washers) | 11 |
| ST700-K167 | Flange mounting hardware kit (pre-engaged parts list) | 11 |
| ST750-K167 | Flange mounting hardware kit (inertia parts list) | 14 |
| ST700K-350 | Exhaust kit (directional housing exhaust cover) | 10 |
| ST700-K351 | Exhaust flange kit (exhaust flange, weld sleeve, cap screws, lock washers, adapter seal) | 11 |
| ST900-GK1 | Gear kit (gear case O-rings, seal, ring gear, bearing and idler gear parts) | 11 |
| ST900-SK1 | Seal kit (exhaust, cylinder, housing, gear case and drive O-rings and seals) | 11 |
| ST700P-TK7 | Tune-up kit for pre-engaged drive models | 11 |
| ST700D-TK8 | Tune-up kit for D ratio models | 11 |
| ST700I-TK6 | Tune-up kit for inertia drive models | 14 |
| ST750L-A53A | Motor assembly, listed for all ST950 right hand models | 10 |
| ST750R-A53A | Motor assembly, listed for all ST950 left hand models | 10 |
| ST799L-A53A | Motor assembly, listed for all ST999 right hand models | 10 |
| ST799R-A53A | Motor assembly, listed for all ST999 left hand models | 10 |
| ST900-A40 | Motor housing assembly | 10 |
| ST900-A37 | Intermediate gear case assembly | 10 |
| ST900-A108 | Idler gear frame assembly | 10 |
| 04324596 | Carrier / ring gear | 14 |
| SS825-K300 | Drive housing kit, all other (B and C ratio) pre-engaged models | 10 |
| SS850-K300 | Drive housing kit, ST900 D ratio models | 10 |
| ST700-K300 | Drive housing kit for model ST950GCDPJ3R493 | 10 |
| SS800R-K587 | Clutch jaw kit, ST900 right hand models | 10 |
| SS800L-K587 | Clutch jaw kit, ST900 left hand models | 10 |
| SS800K-703 | Piston kit, all other (non D ratio) models | 10 |
| SS850K-703 | Piston kit, ST900 D ratio models | 10 |
| SS800R-K8 | Drive shaft kit, B and C ratio right hand models | 10 |
| SS800L-K8 | Drive shaft kit, B and C ratio left hand models | 10 |
| 20BM-299-1 | Starter drive (inertia), right hand models | 14 |
| 20BM-299-3 | Starter drive (inertia), left hand models | 14 |
| ST900-267-24 | Inlet strainer for 1-1/2 in lines | 2 |
Confirm part numbers against the serial and model plate of your starter. For any part not listed in our catalog, send us the number.
Turbine module change-out (starters without directional housing exhaust) (Overview)
- Tag the starter control so the starter cannot be operated during the work.
- Take off the four cap screws holding the inlet flange to the motor housing and keep the O-ring from under the flange.
- Remove the four starter assembly cap screws at the rear of the starter.
- Lift the turbine module and housing exhaust cover assembly out of the gear case together.
- Fit the replacement module with its front cutout facing the large drive gear in the gear case.
- Refit the four starter assembly cap screws, torquing each to 45-50 ft-lb in 20 ft-lb steps.
- Grease the saved O-ring, refit the inlet flange, remove the tag and test the starter.
An outline only. Follow the full procedure, torque values and safety warnings in the document (from page 22).
Barring over the engine (pre-engaged models) (Overview)
- Disconnect the 1/4 in hose at the drive housing OUT port and plug that port with a 1/4 in pipe plug.
- Apply at least 70 psig (4.8 bar) to the drive housing IN port so the pinion engages the flywheel.
- Turn the motor assembly by hand with a 6 in long hex wrench until the engine reaches the required position.
An outline only. Follow the full procedure, torque values and safety warnings in the document (from page 3).
Frequently Asked Questions
What is the difference between the ST950 and ST999 air starters?
In the ordering table the ST950 models have a maximum supply pressure of 150 psig (1034 kPa) and the ST999 models 90 psig (621 kPa). Both share the Series ST900 construction and model coding.
How long can an ST900 starter crank before it must rest?
The operating guidelines say that if the engine has not started after 30 seconds of cranking, stop and let the starter cool for 2-1/2 minutes before trying again. The ST900 is described as designed for long-crank, heavy-duty use.
What oil does the ST900 starter gearing use and how much?
Add 175 ml (about 1/3 pint) of Dexron II automatic transmission fluid through the side plug hole in the motor housing, plus 15 ml of Dexron II at the exhaust pipe plug hole.
What is the ST900 turbine module and can it be swapped as a unit?
The manual defines the turbine module as the motor rotor assembly, exhaust kit, motor housing and intermediate gear case, and gives a change-out procedure that removes and replaces it as one unit from the gear case.
Which inlet strainer does an ST900 starter need?
An ST900-267 strainer (or equivalent) is required on all starters in stationary applications. Sizes are ST900-267-24 for 1-1/2 in lines, ST900-267-32 for 2 in and ST900-267-64 for 4 in lines.
Need the parts or the starter in this document? Send the model number from your starter's plate and we will confirm the right Ingersoll Rand part or replacement.
Source: Ingersoll Rand, Form P7156, No. 03540598, Edition 12, September 2010. Summary and tables prepared by AirStartersDirect.com, an authorized Ingersoll Rand air starter distributor; the PDF is the authoritative version. Page numbers refer to the PDF file. Reviewed October 2026.
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