SPRING ASSEM. 3P5168 - Caterpillar

Overhaul Intervals
Some factors that are important for determining the overhaul intervals include the following considerations:
Performance of preventive maintenance
Use of recommended lubricants
Use of recommended coolants
Use of recommended fuels
Proper installation
Operating conditions
Operation within acceptable limits
Engine load
Engine speedGenerally, engines that are operated at a reduced load and/or speed achieve more service life before an overhaul. However, this service life is for engines that are properly operated and maintained.Other factors must be considered for determining a major overhaul:
The total amount of fuel consumption
The service hours of the engine
An increase of oil consumption
An increase of crankcase blowby
The wear metal analysis of the lube oil
An increase in the levels of noise and vibrationAn increase of wear metals in the lube oil indicates that the bearings and the surfaces that wear may need to be serviced. An increase in the levels of noise and vibration indicates that rotating parts require service.Note: Oil analysis can indicate a decrease of wear metals in the lube oil. The cylinder liners may be worn so that polishing of the bore occurs. Also, the increased use of lube oil will dilute the wear metals.Monitor the engine as the engine accumulates service hours. Consult your Cat dealer about scheduling a major overhaul.Note: The driven equipment may also require service when the engine is overhauled. Refer to the literature that is provided by the OEM of the driven equipment.Using Fuel Consumption For Calculating the Overhaul Intervals
Experience has shown that maintenance intervals are most accurately based on fuel consumption. Fuel consumption corresponds more accurately to the engine load. Table1 list average ranges of fuel consumption and service hours for a load factor of approximately 60 percent. Use the range of fuel consumption only as a guideline.
Table 1
Maintenance Interval Schedule
Service Hours and Fuel Consumption for 3516C Engines (1)
Interval Rated Up To 1300 RPM Rated 1301 To 1600 RPM Rated 1601 To 1800 RPM
250 Service Hours 44000 L (11600 US gal) 53000 L (14000 US gal) 64500 L (17000 US gal)
500 Service Hours 88000 L (23200 US gal) 106000 L (28000 US gal) 129000 L (34000 US gal)
1000 Service Hours 176000 L (46500 US gal) 212000 L (56000 US gal) 258000 L (68000 US gal)
2000 Service Hours 352000 L (93000 US gal) 424000 L (112000 US gal) 516000 L (136000 US gal)
3000 Service Hours 528700 L (139500 US gal) 636700 L (168100 US gal) 773000 L (204000 US gal)
6000 Service Hours 1056000 L (279000 US gal) 1272000 L (336000 US gal) 1548000 L (408000 US gal)
Top End Overhaul 11000 Service Hours 9000 Service Hours 7500 Service Hours
2000000 L (528000 US gal)
Second Top End Overhaul 22000 Service Hours 18000 Service Hours 15000 Service Hours
4000000 L (1056000 US gal)
Major Overhaul 33000 Service Hours 27000 Service Hours 22500 Service Hours
6000000 L (1584000 US gal)
(1) Fuel consumption is based on a load factor of approximately 60 percent.Use the actual records of fuel consumption, when possible. If the actual records are not available, use