3479761 BRAKE GP-HYD CALIPER SERVICE Caterpillar parts
725, 725C, 730, 730C, D250E II, D300E, D300E II
Rating:
Alternative (cross code) number:
CA3479761
347-9761
3479761
CA3479761
347-9761
3479761
Weight: 104 pounds 47 kg.
ARTICULATED TRUCK, EJECTOR TRUCK,
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Compatible equipment models: 3479761:
Information:
All 3408 And 3412 Engines Equipped With Hydramechanical GovernorsSERVICE MAGAZINE, OCTOBER 18, 1982, PAGE 1. Some of the information in the article "Changes In Engine RPM; Governor Does Not Operate Correctly" is not correct. Put a mark through that article, and make reference to this article.
Reports show that some of the above engines have had trouble with surges (changes) in engine rpm. It has been found that the cause of this problem in many applications is low oil pressure in the governor hydraulic servo mechanism. The governor servo will operate at low oil pressure, but its action may not be correct. This is because the low oil pressure can not move the rack as rapidly as is necessary. The procedure that follows can be used in troubleshooting the cause of the low oil pressure.
1. Check the governor oil pressure at the fuel transfer pump. See Illustration 1. The specification for the governor oil pressure is 620 to 690 kPa (90 to 100 psi) when the engine rpm is between low and high idle. But, a governor oil pressure of 585 to 760 kPa (85 to 110 psi) is acceptable.2. Check the engine oil pressure. Acceptable oil pressures are 205 25 kPa (30 4 psi) at 800 rpm and 380 35 kPa (55 5 psi) at 2000 rpm.3. If low oil pressures are found in Steps 1 or 2, the cause of these must be found and corrected. Some possible causes are: a. A restriction in the oil flow, such as a plugged orifice in the fuel transfer pump housing. See Illustration 1. This orifice is a passage for oil into the governor oil pump. The diameter of this orifice must be 1.57 mm (.062"). If this diameter is too small, the servo mechanism will not get enough oil.
Illustration 1. Test location for governor oil pressure and location of orifice.b. A failure of the governor oil pump.c. Bypass valve does not operate. The valve may be held open.
Illustration 2. Location of bypass valve and governor oil pump.
Reports show that some of the above engines have had trouble with surges (changes) in engine rpm. It has been found that the cause of this problem in many applications is low oil pressure in the governor hydraulic servo mechanism. The governor servo will operate at low oil pressure, but its action may not be correct. This is because the low oil pressure can not move the rack as rapidly as is necessary. The procedure that follows can be used in troubleshooting the cause of the low oil pressure.
1. Check the governor oil pressure at the fuel transfer pump. See Illustration 1. The specification for the governor oil pressure is 620 to 690 kPa (90 to 100 psi) when the engine rpm is between low and high idle. But, a governor oil pressure of 585 to 760 kPa (85 to 110 psi) is acceptable.2. Check the engine oil pressure. Acceptable oil pressures are 205 25 kPa (30 4 psi) at 800 rpm and 380 35 kPa (55 5 psi) at 2000 rpm.3. If low oil pressures are found in Steps 1 or 2, the cause of these must be found and corrected. Some possible causes are: a. A restriction in the oil flow, such as a plugged orifice in the fuel transfer pump housing. See Illustration 1. This orifice is a passage for oil into the governor oil pump. The diameter of this orifice must be 1.57 mm (.062"). If this diameter is too small, the servo mechanism will not get enough oil.
Illustration 1. Test location for governor oil pressure and location of orifice.b. A failure of the governor oil pump.c. Bypass valve does not operate. The valve may be held open.
Illustration 2. Location of bypass valve and governor oil pump.
Caterpillar SIS machinery equipment:
Caterpillar SIS
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347-9761
BRAKE GP-HYD CALIPER SERVICE
Caterpillar parts catalog:
Parts brake Caterpillar catalog:
1608009
BRAKE GP-PARKING
725, 725C, 730, 730C, 735, 735B, 740, 740B
725, 725C, 730, 730C, 735, 735B, 740, 740B
1607200
BRAKE GP-PARKING
725, 725C, 730, 730C, 735, 735B, 740, 740B
725, 725C, 730, 730C, 735, 735B, 740, 740B
1454944
BRAKE GP-SERVICE
D300E, D300E II
D300E, D300E II
1597596
BRAKE GP-SERVICE
725, 730, D250E II, D300E, D300E II
725, 730, D250E II, D300E, D300E II
1394126
BRAKE & PLANETARY GP
2470C, 2570C, 2670C, 2864C, 525B, 525C, 533, 535B, 535C, 543, 545, 545C, 553C, 563C, 573C, 586C, HA770, HA771, HA870, HA871, TK370, TK371, TK380, TK381
2470C, 2570C, 2670C, 2864C, 525B, 525C, 533, 535B, 535C, 543, 545, 545C, 553C, 563C, 573C, 586C, HA770, HA771, HA870, HA871, TK370, TK371, TK380, TK381
8E5275
BRAKE & DIFFERENTIAL DRIVE GP
D6H, D6H II, D6H XL, D6H XR, D6R, D6R II
D6H, D6H II, D6H XL, D6H XR, D6R, D6R II
8D2180
BRAKE GP
14G, 14H, 14H NA
14G, 14H, 14H NA
2839987
BRAKE GP-PARKING
824G, 824G II, 824H, 824K, 825G, 825G II, 825H, 825K, 826G, 826G II, 826H, 826K, 980G, 980G II, 980H, 980K, 980K HLG, R1700 II
824G, 824G II, 824H, 824K, 825G, 825G II, 825H, 825K, 826G, 826G II, 826H, 826K, 980G, 980G II, 980H, 980K, 980K HLG, R1700 II
1120757
BRAKE & PLANETARY GP
950G, 950G II, 950H, 950K, 962G, 962G II, 962H, 962K, IT62G, IT62G II, IT62H
950G, 950G II, 950H, 950K, 962G, 962G II, 962H, 962K, IT62G, IT62G II, IT62H
2677418
BRAKE & PLANETARY GP
928HZ, 930G, IT28G
928HZ, 930G, IT28G
3S2034
BRAKE GP
977K
977K
2871717
BRAKE GP-SERVICE
844H, 844K, 990K
844H, 844K, 990K
5T3280
BRAKE GP-SERVICE & PARKING
784B, 784C, 785, 785B, 785C
784B, 784C, 785, 785B, 785C
1604991
BRAKE RELEASE AR
R1600, R1600G
R1600, R1600G