Filtration Procedure for Hydraulic Oil in Compact Equipment {0680, 0768, 5050, 5056} Caterpillar


Filtration Procedure for Hydraulic Oil in Compact Equipment {0680, 0768, 5050, 5056}

Usage:

IT14G 1WN


Compact Track Loader
239D (S/N: CD41-UP; BL91-UP)
249D (S/N: AH91-UP; GWR1-UP)
259B3 (S/N: YYZ1-UP)
259D (S/N: FTK1-UP; FTL1-UP)
279C (S/N: MBT1-UP)
279C2 (S/N: KWB1-UP)
279D (S/N: GTL1-UP; PPT1-UP)
289C (S/N: JMP1-UP)
289C2 (S/N: RTD1-UP)
289D (S/N: WCT1-UP; TAW1-UP)
299C (S/N: JSP1-UP; NMP1-UP)
299D (S/N: HCL1-UP)
299D XHP (S/N: NLC1-UP)
299D2 (S/N: FD21-UP)
299D2 XHP (S/N: DX21-UP)
Compact Wheel Loader
901C (S/N: W4T1-UP)
901C2 (S/N: YKY1-UP)
902C (S/N: W5T1-UP)
902C2 (S/N: YKT1-UP)
903C (S/N: MW41-UP; W6T1-UP)
903C2 (S/N: MW81-UP; YKL1-UP)
903D (S/N: MZY1-UP)
904B (S/N: B4L1-UP)
904H (S/N: H4T1-UP)
906 (S/N: MER1-UP; 6ZS1-UP)
906H (S/N: TPE1-UP; SDH1-UP)
906H2 (S/N: JRF1-UP)
906K (S/N: L661-UP)
906M (S/N: H661-UP; K561-UP; Z661-UP)
907H (S/N: MJF1-UP; SJM1-UP)
907H2 (S/N: JRS1-UP)
907K (S/N: L771-UP)
907M (S/N: H771-UP; K571-UP; Z771-UP)
908 (S/N: TAR1-UP; 8BS1-UP)
908H (S/N: LMD1-UP; MXF1-UP)
908H2 (S/N: JRD1-UP)
908K (S/N: L881-UP)
908M (S/N: H881-UP; K581-UP; Z881-UP)
910K (S/N: L221-UP)
910M (S/N: H221-UP)
914G (S/N: PDF1-UP; 7ZM1-UP; 9WM1-UP)
914K (S/N: L241-UP)
914M (S/N: H241-UP)
918M (S/N: H261-UP)
Excavator
307C (S/N: BNE1-UP; BCM1-UP)
307D (S/N: DSG1-UP)
308C (S/N: KCX1-UP)
Hydraulic Power Unit
HPU300 (S/N: AP31-UP; SHZ1-UP)
Integrated Toolcarrier
IT14B (S/N: 3NJ1-UP)
IT14F (S/N: 4EL1-UP)
IT14G (S/N: FWL1-UP; 8ZM1-UP; KZN1-UP; 1WN1-UP)
Mini Hydraulic Excavator
300.9D (S/N: DW21-UP; LJ21-UP; LJM1-UP; TGP1-UP)
301.4C (S/N: LJ31-UP; LJK1-UP)
301.5 (S/N: MNH1-UP; 3YW1-UP)
301.6 (S/N: MY61-UP; BDH1-UP)
301.6C (S/N: JBB1-UP)
301.7CR (S/N: JH71-UP)
301.7D (S/N: LJ41-UP; LJ81-UP; LJD1-UP; LJH1-UP)
301.8 (S/N: BFA1-UP; H8X1-UP)
301.8C (S/N: JSB1-UP)
302.2D (S/N: LJ51-UP; LJG1-UP)
302.4D (S/N: LJ61-UP; LJN1-UP)
302.5 (S/N: 4AZ1-UP)
302.5C (S/N: GBB1-UP)
302.7D (S/N: LJ71-UP; LJL1-UP)
302CR (S/N: RHM1-UP)
303 (S/N: DMA1-UP; CAR1-UP)
303.5 (S/N: DCH1-UP; AFW1-UP)
303.5C (S/N: DMY1-UP)
303.5D (S/N: RHP1-UP)
303.5E (S/N: JX21-UP; RSE1-UP; SFH1-UP; RKY1-UP)
303.5E2 (S/N: AC51-UP; BG81-UP; CR91-UP; JWY1-UP)
303.5E2 CR (S/N: CR61-UP; DWD1-UP)
303C (S/N: BXT1-UP)
303E (S/N: CR71-UP; SGE1-UP; SMG1-UP)
303E CR (S/N: CK31-UP; FR31-UP)
304 (S/N: NAD1-UP; BTN1-UP)
304.5 (S/N: WAK1-UP; ANR1-UP)
304.5E2 (S/N: FXT1-UP)
304C (S/N: FPK1-UP)
304D (S/N: TYK1-UP)
304E (S/N: SSC1-UP; TTN1-UP; TSR1-UP)
304E2 (S/N: CJ21-UP; ME41-UP; GC51-UP)
304E2 CR (S/N: KC41-UP)
305 (S/N: DSA1-UP; DGT1-UP; BMW1-UP)
305.5 (S/N: DCK1-UP)
305.5D (S/N: FLZ1-UP)
305.5E (S/N: MX51-UP; YGB1-UP; FSC1-UP; FKY1-UP)
305.5E2 (S/N: WE21-UP; CR51-UP; FR51-UP; NC51-UP; EJX1-UP)
305.5E2 CR (S/N: SHW1-UP; HRX1-UP)
305C (S/N: HWJ1-UP)
305D (S/N: XER1-UP)
305E (S/N: XSC1-UP; WDL1-UP)
305E2 (S/N: BZ51-UP; DF51-UP; H5M1-UP)
305E2 CR (S/N: R5C1-UP; PYR1-UP; DJX1-UP)
306 (S/N: MXH1-UP)
306E2 (S/N: E2W1-UP)
307E (S/N: H1Y1-UP)
307E2 (S/N: CE21-UP; KC91-UP)
308D (S/N: FYC1-UP; GBT1-UP)
308E (S/N: JBE1-UP; GBJ1-UP; HEL1-UP; HAM1-UP; JSN1-UP; TAZ1-UP)
308E2 (S/N: EC21-UP; MY21-UP; TM21-UP; SR81-UP; F8C1-UP; FJX1-UP)
308E2 CR (S/N: MC51-UP; CE81-UP; PC81-UP; W8S1-UP)
308E2SR (S/N: JC51-UP; KC51-UP)
Multi Terrain Loader
287C (S/N: MAS1-UP)
247 (S/N: CML1-UP)
247B (S/N: MTL1-UP)
247B2 (S/N: MTL1-UP)
247B3 (S/N: TSL1-UP)
257 (S/N: CMM1-UP)
257B (S/N: SLK1-UP)
257B Series 3 (S/N: B7H1-UP)
257D (S/N: EML1-UP; EZW1-UP)
267 (S/N: CMP1-UP)
267B (S/N: CYC1-UP)
277 (S/N: CNC1-UP)
277B (S/N: MDH1-UP)
277C (S/N: KCC1-UP; JWF1-UP)
277C2 (S/N: MET1-UP)
277D (S/N: FMT1-UP; MLT1-UP)
287 (S/N: CNY1-UP)
287B (S/N: ZSA1-UP)
287C2 (S/N: SSB1-UP)
287D (S/N: STK1-UP; HMT1-UP)
297C (S/N: LMB1-UP; GCP1-UP)
297D (S/N: BE71-UP)
297D XHP (S/N: HP71-UP)
297D2 (S/N: BL71-UP)
297D2 XHP (S/N: HP21-UP)
Skid Steer Loader
216 (S/N: 4NZ1-UP)
216B (S/N: RLL1-UP)
216B Series 3 (S/N: JXM1-UP)
226 (S/N: 5FZ1-UP)
226B (S/N: MJH1-UP)
226B2 (S/N: MJH1-UP)
226B3 (S/N: MWD1-UP)
226D (S/N: HRD1-UP)
228 (S/N: 6BZ1-UP)
232 (S/N: CAB1-UP)
232B (S/N: SCH1-UP)
232D (S/N: KXC1-UP; DPR1-UP)
236 (S/N: 4YZ1-UP)
236B (S/N: HEN1-UP)
236B2 (S/N: HEN1-UP)
236B3 (S/N: A9H1-UP)
236D (S/N: MPW1-UP; BGZ1-UP)
242 (S/N: CMB1-UP)
242B (S/N: BXM1-UP)
242B Series 3 (S/N: SRS1-UP)
242D (S/N: DZT1-UP; A9W1-UP)
246 (S/N: 5SZ1-UP)
246B (S/N: PAT1-UP)
246C (S/N: JAY1-UP)
246D (S/N: BYF1-UP; HMR1-UP)
248 (S/N: 6LZ1-UP)
248B (S/N: SCL1-UP)
252 (S/N: FDG1-UP)
252B (S/N: SCP1-UP)
252B Series 3 (S/N: TNK1-UP)
256C (S/N: DWS1-UP)
262 (S/N: CED1-UP)
262B (S/N: PDT1-UP)
262C (S/N: MST1-UP)
262C2 (S/N: TMW1-UP)
262D (S/N: DTB1-UP; KTS1-UP)
268B (S/N: LBA1-UP)
272C (S/N: RED1-UP)
272D (S/N: GSL1-UP)
272D XHP (S/N: SHY1-UP)
272D2 (S/N: BL21-UP)
272D2 XHP (S/N: MD21-UP)

Introduction

Table 1
Revision  Summary of Changes SEBF8726 
35  Added new serial number prefixes for New Product Introduction. 
34  Added new serial number prefixes for New Product Introduction.
Updated structure and grammar of document. 
33  Added new serial number prefixes for New Product Introduction.
Updated minimum ISO acceptable contamination control levels. 
32  Added new serial number prefixes for New Product Introduction. 
31  Added new serial number prefixes for New Product Introduction.
Updated copyright date to 2018.
NENG2500, "Dealer Service Tool Catalog" removed from references table. , PERJ1017, "Dealer Service Tool Catalog" added to the references table. 

© 2019 Caterpillar All Rights Reserved. This guideline is for the use of Caterpillar dealers only. Unauthorized use of this document or the proprietary processes therein without permission may be violation of intellectual property law.

Information contained in this document is considered Caterpillar: Confidential Yellow.

This guideline enables dealers and Caterpillar customers to benefit from cost reductions. These reductions were made possible through an established contamination control program. Fluids used in Caterpillar machines are highly effective unless the fluids contain damaging amounts of contaminates. Every effort must be made to reduce the contamination level within Caterpillar fluid systems.Caterpillar makes ongoing changes and improvements to the Caterpillar products. This procedure must be used with the most recent technical information that is available from Caterpillar. The latest technical information will ensure that such changes and improvements are incorporated throughout the document.

For technical questions when using this document, work with your Dealer Technical Communicator (TC).

To report suspected errors, inaccuracies, or suggestions regarding the document, submit a form for feedback in the Service Information System (SIS Web) interface.

If a Contamination Control Guideline is required, but not available in SIS Web, submit a feedback form in the Service Information System (SIS Web) interface.

Canceled Part Numbers and Replaced Part Numbers

This document may include canceled part numbers and replaced part numbers. Use NPR on SIS for information about canceled part numbers and replaced part numbers. NPR will provide the current part numbers for replaced parts.

Summary

This guideline enables dealers and Caterpillar customers to benefit from cleaner hydraulic systems. The filtration process is easy to use. The filtration unit quickly connects to quick couplers located on the machine. This guideline provides directions for installing and operating the filtration unit.

Clean fluids play a major function in the life of any fluid system. The following procedure will help reduce fluid contamination in the oil to an acceptable level of ISO 18/15 or cleaner.


NOTICE

If the equipment is being serviced due to a catastrophic failure, a complete system cleaning operation is required before initializing this filtration procedure. If the failure is not addressed early, particles from the failed component will contaminate other system components such as valves, pumps, motors, and controls. Additional component cleaning, component exchange, and lines flushing will be required to remove most contaminates generated from the failure. The vehicle system cleaning must be performed prior to the filter cart filtration procedure. This filtration procedure and subsequent particle count testing should be performed as a final step in the repair process.


Important Safety Information



Illustration 1g03374966

Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools to perform these functions properly.

Improper operation, lubrication, maintenance, or repair of this product is dangerous. Improper methods could result in injury or death.

Do not operate or perform any lubrication, maintenance, or repair of this product, until you understand the operation, lubrication, maintenance, and repair information. Safety precautions and warnings are provided in this manual and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons.

Hazards are identified by a safety alert symbol. Safety alert symbols are followed by a signal word such as "Warning" that is shown below.



Illustration 2g01032906

The following is the meaning of this safety alert symbol:

  • Pay attention!

  • Become alert!

  • Your safety is involved.

The message that appears under the warning explains the hazard. The message will be written or pictorially shown.

Operations that may cause product damage are identified by "NOTICE" labels on the product and in this publication.

Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. Therefore, the warnings in this publication and on the product are not all inclusive. If a tool, a procedure, a work method, or an operating technique that is not recommended by Caterpillar is used, ensure that the procedure is safe for all personnel around the machine. Ensure that the product will not be damaged or that the product will not be made unsafe by the operation, lubrication, maintenance, or repair procedures.

All the information, specifications, and illustrations that are in this publication are based on information that was available at the time of publication. The following could change at any time: specifications, torque, pressures, measurements, adjustments, illustrations, and other items. These changes can affect the service that is given to the product. Obtain the most current and complete information before you start any job. Caterpillar dealers have the most current information that is available.

Safety

------ WARNING! ------

Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.

To prevent possible injury, perform the procedure that follows before testing and adjusting the steering system.


------ WARNING! ------

Personal injury can result from hydraulic oil pressure and hot oil.

Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.

Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.



NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Refer to Special Publication, PERJ1017, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.

Dispose of all fluids according to local regulations and mandates.


References

Table 2
References 
Media Number  Title 
NEHS0799  "Tool Operating Manual 170-8500 Analyzer Group" 
PERJ1017  "Dealer Service Tool Catalog" 
PEGJ0045  "Reporting Particle Count by ISO code" 
PEGJ0047  "How to Take A Good S·O·S Sample" 
SEBF8482  "Obtaining Oil Samples for Analysis" 

Tooling and Equipment

Table 3
Required Equipment(1) 
Quantity  Part Number  Part Description 
5.79 m (19 ft)  165-0018  Hose 
221-0575  Permanent Coupling 
030-8190  Connector 
3D-2824  O-ring Seal 
6V-4362  Connector 
3J-1907  O-ring Seal 
152-8181  Fitting As 
152-8182  Fitting As 
(1) For Serial Number Prefixes: BFA, 4AZ, 3YW, BDH, JBB, JSB, GBB, MBT, JSP, JWF, MAS, JMP, MJH, GCP, 6BZ, BXM, JAY, 6LZ, SCL, DWS, MST, LBA, RED, RTD, TMW, MET, KWB, SSB, SHY, GSL, HCL, NLC, BGZ, DZT, EZW, FTL, HAM, JSN, HEL, JBE, BE7, HP7, BL2, HP2, FD2, DX2, MD2, HP2, BL7, TGP, DW2, AP3, SHZ, JX2

Table 4
Required Tools(1) 
Quantity  Part Number  Part Description 
5.79 m (19 ft)  165-0018  Hose 
221-0575  Permanent Coupling 
030-8190  Connector 
3D-2824  O-Ring Seal 
2P-7636  Connector 
3K-0360  O-Ring Seal 
153-2996  Fitting As 
153-2997  Fitting As 
(1) For Serial Number Prefixes: AFW, DCH, FYC, GBT, DMY, RHP, BXT, FPK, TYK, FLZ, HWJ, XER, TTN, FKY, RKY, GBJ, H1Y, SSC, TSR, RSE, SFH, YGB, FSC, XSC, WDL, LJD, SMG, CR7, TAZ, FJX, MX5, DJX, EJX, CJ2, BG8, TM2, SR8, MY2, EC2, E2W, BG8, CJ2, H5m, JWY, ME4, DF5, GC5, AC5, SGE, JX2

Table 5
Required Equipment(1) 
Quantity  Part Number  Part Description 
5.79 m (19 ft)  165-0018  Hose 
221-0575  Permanent Coupling 
030-8190  Connector 
3D-2824  O-Ring Seal 
9M-4584  Connector 
2M-9780  O-Ring Seal 
153-2995  Fitting As 
153-2994  Fitting As 
1(2)  8T-7909  Adapter 
1(2)  8K-4739  Adapter 
(1) For Serial Number Prefixes: BNE, BCM, DSG, KCX, 3NJ, 4EL, FWL, 8ZM, KZN, 1WN, WAK, ANR, DCK, MXH, MTL, 4NZ, RLL, 5FZ, CAB, SCH, 4YZ, HEN, CMB, 5SZ, FDG, SCP, CED, B4L, H4T, MER, 6ZS, TPE, SDH, MJF, SJM, TAR, 8BS, LMD, MXF, PDF, 7ZM, 9WM, BMW, CAR, DSA, BTN, NAD, DMA, DGT, CML, CMM, CMP, CNC, CNY, CYC, MDH, ZSA, LJH, LJN, LJG, EML, FTK, HMR, KTS, MLT, PPT, STK, WCT, MPW, A9W, LJD, GTL, TAW, FMT, HMT, BYF, DTB, JRF, JRS, JRD, L88, L77, H77, H88, L66, H66, Z66, K56, K57, K58, Z77, Z88, CE2, WE2, H1Y, F8C, YKY, YKT, YKL, MW8, H22, L22, H24, L24, H26, KC9, H22, L22, H24, L24, H26, DWD, PYR, HRX, KC5, CK3, CR6, SHW, FR3, KC4, CE8, R5C, MCS, JC5, PC8, W8S, MZY
(2) For serial number prefixes: W4T, W5T, W6T, MW4

Table 6
Required Equipment(1) 
Quantity  Part Number  Part Description 
5.79 m (19 ft)  165-0018  Hose 
8T-1710  Permanent Coupling 
347-4431  Quick Disconnect 
347-4432  Quick Disconnect 
221-0574  Permanent Coupling 
030-8190  Connector 
3D-2824  O-Ring Seal 
8T-7909  Adapter 
8K-4739  Adapter 
(1) For Serial Number Prefixes: TSL, TNK, A9H, B7H, SRS, YYZ, MWD, JXM, NMP, MTL, SLK, KCC, LMB, RLL, MJH, SCH, BXM, PAT, SCP, PDT, HRD, DPR, KXC, BL9, CD4, GWR, AH9

Table 7
Optional Equipment 
Part Number  Part Description 
170-8500  Analyzer Gp 
210-5530  Quick Connect Coupler 
188-0639  Hose As 
220-8607  Fitting 

Assembling the Filtration Adapters



Illustration 3g01178288
Filtration unit assembly


Illustration 4g01178289
(1) 225-3114 High Pressure Filter Gp
(2) 3D-2824 O-Ring Seal
(3) 030-8190 Connector
(4) 221-0575 Coupling
(5) 165-0018 Hose (Two Lines, 5 ft Long)

Assemble the Hose (5), Couplings (4), Connector (3), and O-Ring Seals (2), to the High Pressure Filter Gp (1).

Compact Equipment Hydraulic Oil Filtering Procedure

This guideline is intended for compact equipment only. The procedure is most effective when performed immediately after the oil has been warmed to 50 °C (122 °F) and mixed from operation. Warming the oil allows any contamination in the system oil to be placed in suspension. Warming the oil to operating temperature also lowers the viscosity of the system oil.



Illustration 5g01178293
Filter setup

Note: The 225-3114 High-Pressure Filter Gp is a full bridge check valve unit. The hydrostatic filter group allows oil to flow in either of the hose ports or flow out either of the hose ports. The filter will only pass oil one direction through the filter. Refer to the schematic for the 225-3114 High-Pressure Filter Group shown in Illustration 6.



Illustration 6g01178295
Schematic for 225-3114 High Pressure Filter Gp

Filtration Setup

------ WARNING! ------

At operating temperature, the hydraulic tank is hot and under pressure.

Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin.

Remove the filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. Remove the filler cap slowly in order to relieve pressure.



NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.


------ WARNING! ------

Personal injury or death can result from sudden machine movement.

Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.

To help prevent possible injury before testing and adjusting any hydraulic system, perform the procedure that follows:


  1. Operate the machine to warm the oil.

  2. Park the machine on level ground.

  3. Lower the attachment to the ground and apply slight pressure.

  4. Turn off the engine.

  5. Chock the wheels, if chocking the wheels is applicable.

Filtration Procedure for Skid Steer Loaders

  1. After the oil has been warmed, and after the engine is turned OFF, turn the engine start key to the ON position.


    Illustration 7g03346743
    (1) Auxiliary hydraulic control switch

  2. Press each side of the auxiliary hydraulic control switch (1) for 1 to 2 seconds to relieve the hydraulic system pressure. Refer to Illustration 7.

  3. Engage the parking brake.


    Illustration 8g03346752
    (2) Machine couplers
    (3) Filter couplers

  4. Connect the machine couplers (2) to the filter couplers (3). Refer to Illustration 8.

  5. Start the machine. Run the machine at high idle. Disengage the parking brake.

  6. Press either side of the auxiliary hydraulic control switch (1) to begin filtering.


    Illustration 9g03346760
    (4) Continuous flow switch

  7. If the machine is equipped with the continuous flow option, hold down the auxiliary hydraulic control switch and press the bottom of the continuous flow switch (4). Release the continuous flow switch. Within one second of releasing the flow switch, release the auxiliary hydraulic control switch to keep the oil cycling. Refer to Illustration 9.

Filtration Procedure for Mini Hydraulic Excavators

Note: Position the excavator so that the hydraulic S·O·S valve is easily accessible.

  1. After the oil has been warmed and the engine is turned off, turn the engine start switch key to the ON position.


    Illustration 10g03346765
    (5) Auxiliary control switch

  2. With the hydraulic control console down, press each end of the auxiliary control pedal (5) for 1 to 2 seconds to relieve the hydraulic system pressure. Refer to Illustration 10.

  3. Raise the hydraulic control console to keep the machine from moving.


    Illustration 11g03346786
    (6) Machine couplers
    (7) Filter Couplers

  4. Connect the machine couplers (6) to the filter couplers (7). Refer to Illustration 11.

  5. Lower the hydraulic control console.

  6. Start the machine and run the machine at high idle.

  7. Press down the control pedal for the auxiliary system (5). Refer to Illustration 10.

  8. Latch down the control pedal to keep the oil cycling if the machine is equipped.

Filtration Procedure for Compact Wheel Loaders

  1. After the oil has been warmed and the engine is turned OFF, turn the engine start switch key to the ON position.


    Illustration 12g03346815
    (8) Multipurpose lever

  2. Push the multipurpose lever (8) forward and backward to relieve the hydraulic system pressure. Refer to Illustration 12.

  3. Engage the parking brake.


    Illustration 13g03346816
    (9) Machine couplers
    (10) Filter couplers

  4. Connect the machine couplers (9) to the filter couplers (10). Refer to Illustration 13.

  5. Start the machine and run the machine at high idle.

  6. Release the parking brake.

  7. Push the multipurpose lever (8) forward to begin filtering. Refer to Illustration 12.


    Illustration 14g03346820
    Multipurpose lever in the LOCKED position

  8. Pull the multipurpose lever (8) backward until the lever locks to keep the oil cycling if the machine is equipped. Refer to Illustration 14.

Portable Particle Analyzer Procedure

Note: Caterpillar recommends taking a baseline particle count on the oil at the beginning of the filter cycle.

The oil can be particle count tested for cleanliness in one of the two following ways:

  • Use a 170-8500 Analyzer Gp.

  • Collect a bottle sample and send the sample to an S·O·S lab.

Note: Be sure to read and understand the Tool Operating Manual before operating the portable particle analyzer.



    Illustration 15g03346828
    Typical S·O·S port connection
    (11) S·O·S valve
    (12) 210-5530 Quick Connect Coupler
    (13) 188-0639 Hose As

  1. Attach the 210-5530 Quick Connect Coupler (12) and fabricated suction tube (13) to the S·O·S valve (11) on the machine.

    Note: The S·O·S valve-specific location can be found in the Operation and Maintenance Manual for the machine.

  2. Attach the other end of the fabricated suction tube (13) to the portable particle counter as called for in the Tool Operating Manual.

    Note: A 188-0639 Hose As will need to be purchased prior to assembly.



    Illustration 16g03346830
    Typical S·O·S port connection
    (11) S·O·S valve
    (14) 169-8373 Fluid Sampling Bottle

  3. If collecting a bottle sample, use the same S·O·S valve (11) and a 169-8373 Fluid Sampling Bottle (14).

  4. Record an oil sample reading from the S·O·S valve (11) on the machine at the beginning and end of the filter cycle.

Finishing the Filtration Process

  1. At the halfway point of the filtration procedure, stop the procedure and change the hydraulic oil filter. Changing the filter allows the filter to help with cleaning the system. The new filter can remain in place until the next scheduled filter change. Changing the filter now avoids opening the filter housing after the system has been cleaned. An open filter housing is an inlet for contamination.

  2. Cycle the oil until the portable particle analyzer indicates that the oil has reached an acceptable contaminant level of a minimum ISO 18/15. Take a final oil sample and record the final ISO level before the machine is returned to the field.

    Note: Refer to Table 8 at the end of this document when a portable particle analyzer is not available.

  3. When the target ISO level or time interval has been met, turn off the machine and relieve the system pressure.

  4. Disconnect the filter couplers from the machine couplers.

  5. Check the hydraulic tank oil level and return the machine to service.

Oil Compartment Filtration Times

Table 8
Cycle Times for Various Models 
Model  Minutes for Filtration 
Mini Excavators 
301.5, 301.6, 301.8  41 minutes 
302.5  35 minutes 
303.5  37 minutes 
304.5, 304  34 minutes 
305  32 minutes 
Skid Steer Loaders 
216, 226  35 minutes 
228  45 minutes 
236, 246  27 minutes 
248  43 minutes 
252, 262  25 minutes 
267, 277  24 minutes 
Small Wheel Loaders 
901, 902, 903, 904  45 minutes 
906  35 minutes 
908  27 minutes 

ISO 4406 Method for Coding the Level of Contamination by Solid Particles

ISO (International Organization of Standardization) is a worldwide federation of national standards bodies. The ISO 4406 specifies the code to be used in defining the quantity of solid particles in the fluid used in any given hydraulic fluid power system. An automatic particle counter derives the equivalent size of a particle from the cross sectional area of the particle. Particle counts are affected by various factors. These factors include procurement of the sample, the sample container, particle counting accuracy, where used and the particle counter cleanliness. Proper care should be taken during sample procurement to ensure that the sample obtained is representative of the fluid circulation in the system.

The code for contamination levels using automatic particle counters is composed of three scale numbers. Example X/Y/Z

"X" - The number of particles that is equal to or larger than 4 microns.

"Y" - The number of particles that is equal to or larger than 6 microns.

"Z" - The number of particles that is equal to or larger than 14 microns.

Currently Caterpillar does not require the reporting of the "X" scale number. The hydraulic tolerances exceed the 4 micron value, therefore a "-" is used instead of a number. For example, a particle count is read as -/Y/Z, meaning that there was no requirement to count particles equal to or larger than 4 microns.

Clean Out Filters Versus Filter Cart Filtration

After any open system repair, on-site S·O·S sampling and particle counting is required. S·O·S sampling and particle counting should be accomplished by exercising the specific system until the fluid is at normal operating temperature. Exercising the specific system ensures that the oil and representative oil will be collected during the S·O·S process. An ISO 16/13 maximum cleanliness target has been established for most hydraulic and transmission systems. Refer to the machine system cleanliness targets to your specific machine.

System Oil Meets Recommended Cleanliness Targets:

  1. Change the standard hydraulic system filter with a high efficiency filter prior to returning that machine to the customer. A high efficiency filter ensures that unnoticed system contamination and new part break-in debris will be properly filtered out during the initial hours after any repair.

  2. Instruct the customer that the high efficiency filter should be changed prior to 250 hours of operation.

  3. After the high efficiency filter has been removed, the filter should be cut open and the amount of captured debris should be checked. If a large amount of debris is present, a second high efficiency filter should be installed and then rechecked after 100 hours. When a small amount of debris is present, a standard filter can then be installed.

System Oil Does Not Meet Recommended Cleanliness Targets:

  1. Filter cart filtration is required.

  2. Change the standard filter with a high efficiency filter halfway through the filter cart procedure explained in this guideline.

  3. Continue to filter according to the time interval at the end of this document or continue filtering until the system meets the minimum recommended ISO level.

  4. Leave the installed high efficiency filter on the machine. The filter should last at least 8 hours, and should be replaced prior to 250 hours.
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