Predictive Maintenance Services, Inc.

Wear Metal Limit Guidelines

Wear metal limits shown here are fairly broad since typical values can vary significantly by type of service, manufacturer and even make and model.  Use these as general guidelines only.  Wear rates should be trended over time to determine what is typical for your application.

Compartment Iron Chromium Lead Copper Tin Aluminum Nickel Silver Titanium Vanadium Manganese Antimony Cadmium
Engine                          
Normal < 100 < 15 < 40 < 20 < 20 < 20 < 10 < 12 < 5 < 5 < 5 < 5 < 5
Slightly High 100-150 15-30 40-75 20-30 20-30 20-50 10-20 12-20 5-10 5-10 5-10 5-10 5-10
Caution 150-200 30-40 75-100 30-50 30-40 50-75 20-30 20-30

10-15

10-15

10-15

10-15

10-15

Severe

200-250

40-80 100-125 50-75

40-50

75-100 30-50 30-40

15-20

15-20

15-20

15-20

15-20

Critical

Over 250

Over 80 Over 125 Over 75 Over 50

Over 100

Over 50 Over 40 Over 20 (May be additive)

Over 20

Over 20

Over 20

Over 20

                           
Compartment Iron Chromium Lead Copper Tin Aluminum Nickel Silver Titanium Vanadium Manganese Antimony Cadmium
Transmission
(automatic)
                         
Normal < 100 < 15 < 75 < 150

< 15

< 15

< 10

< 12 < 5 < 5

Does not apply

Does not apply

< 5
Slightly High

100-150

15-30

75-100

150-250

15-25

15-50

10-20

12-20

5-10

5-10

   

5-10

Caution

150-200

30-50

100-200

250-300

25-50

50-75

20-30

20-30

10-15

10-15

   

10-15

Severe

200-300

50-75

200-250

300-400

50-75

75-100

30-40

30-40

15-20

15-20

   

15-20

Critical

Over 300

Over 75

Over 250

Over 400

Over 75

Over 100

Over 40

Over 40

Over 20

Over 20
(May be additive)

   

Over 20

                           
Compartment Iron Chromium Lead Copper Tin Aluminum Nickel Silver Titanium Vanadium Manganese Antimony Cadmium
Hydraulic                          
Normal

< 50

< 15

< 25

< 25

<15

<15

<10

Does not apply

Does not apply

< 5

Does not apply

Does not apply

< 5

Slightly High

50-75

15-25

25-50

25-50

15-25

15-50

10-20

   

5-10

   

5-10

Caution

75-150

25-50

50-75

50-75

25-75

50-75

20-30

   

10-15

   

10-15

Severe

150-250

50-75

75-100

75-100

75-100

75-100

30-40

   

15-20

   

15-20

Critical

Over 250

Over 75

Over 100

Over 100

Over 100

Over 100

Over 40

   

Over 20

   

Over 20

                           
Compartment Iron Chromium Lead Copper Tin Aluminum Nickel Silver Titanium Vanadium Manganese Antimony Cadmium
Gear Box                          
Normal

< 200

< 20

< 45

< 100

< 20

< 20

< 20

Does not apply

Does not apply

< 5

< 5

Does not apply

< 5

Slightly High

200-400

20-50

45-75

100-150

20-50

20-50

20-40

   

5-10

5-10

 

5-10

Caution

400-600

50-75

75-100

150-200

50-75

50-75

40-50

   

10-15

10-15

 

10-15

Severe

600-700

75-100

100-150

200-250

75-100

75-100

50-60

   

15-20

15-20

 

15-20

Critical

Over 700

Over 100

Over 150

Over 250

Over 100

Over 100

Over 60

   

Over 20

Over 20

 

Over 20

                           
Compartment Iron Chromium Lead Copper Tin Aluminum Nickel Silver Titanium Vanadium Manganese Antimony Cadmium
Compressor                          
Normal

< 50

< 15

< 25

< 25

<15

< 15

<10

Does not apply

Does not apply

< 5

Does not apply

Does not apply

< 5

Slightly High

50-75

15-25

25-50

25-50

15-25

15-50

10-20

   

5-10

   

5-10

Caution

75-150

25-50

50-75

50-75

25-75

50-75

20-30

   

10-15

   

10-15

Severe

150-200

50-75

75-100

75-100

75-100

75-100

30-40

   

15-20

   

15-20

Critical

Over 200

Over 75

Over 100

Over 100

Over 100

Over 100

Over 40

   

Over 20

   

Over 20