2559873 PLATE Caterpillar parts
321C
Rating:
Alternative (cross code) number:
CA2559873
255-9873
2559873
CA2559873
255-9873
2559873
EXCAVATOR,
Compatible equipment models: 2559873:
Number on catalog scheme:
1
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Information:
Testing and Charging the Pilot System Accumulators
Stop the engine. Release the pressure from the pilot hydraulic system. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release".Gas pressure is variable with temperature. Check the temperature of the air around the accumulator. In order to check the amount of charge in an accumulator, the accumulator must be at the same temperature as the surrounding air.Note: The temperature of the accumulator may change as the accumulator is being charged due to the expansion or compression of the nitrogen charge. It may be necessary to charge the accumulator in several steps in order to ensure a correct charge.
Table 2
Charge Pressures and Temperatures
Temperature Pressure
-23°C (-10°F)
1495 kPa (217 psi)
-21°C (-5°F)
1516 kPa (220 psi)
-18°C (0°F)
1529 kPa (222 psi)
-15°C (5°F)
1550 kPa (225 psi)
-12°C (10°F)
1564 kPa (227 psi)
-9°C (15°F)
1577 kPa (229 psi)
-7°C (20°F)
1598 kPa (232 psi)
-4°C (25°F)
1612 kPa (234 psi)
-1°C (30°F)
1632 kPa (237 psi)
2°C (35°F)
1646 kPa (239 psi)
4°C (40°F)
1660 kPa (241 psi)
7°C (45°F)
1681 kPa (244 psi)
10°C (50°F)
1694 kPa (246 psi)
13°C (55°F)
1715 kPa (249 psi)
16°C (60°F)
1729 kPa (251 psi)
18°C (65°F)
1750 kPa (254 psi)
21°C (70°F)
1763 kPa (256 psi)
24°C (75°F)
1777 kPa (258 psi)
27°C (80°F)
1798 kPa (261 psi)
29°C (85°F)
1812 kPa (263 psi)
32°C (90°F)
1832 kPa (266 psi)
35°C (95°F)
1846 kPa (268 psi)
38°C (100°F)
1860 kPa (270 psi)
41°C (105°F)
1880 kPa (273 psi)
43°C (110°F)
1894 kPa (275 psi)
46°C (115°F)
1915 kPa (278 psi)
49°C (120°F)
1929 kPa (280 psi) If an accumulator has less than half of the required amount of precharge pressure, the accumulator should be charged. Oil in the accumulator will give an inaccurate precharge reading.
Illustration 1 g00995368
Accumulator (Typical Example) (1) Cap
Illustration 2 g00457381
175-5507 Nitrogen Charging Group (2) Pressure gauge (3) Connection to the nitrogen cylinder (4) Regulator (5) Valve (6) Pressure gauge (7) Pressure regulating screw (8) Valve handle (9) Chuck
Make sure that valve (5) is closed.
Remove cap (1) from the accumulator.
Rotate valve handle (8) on chuck (9) counterclockwise until the valve handle reaches the full out position. Install chuck (9) on the accumulator
Stop the engine. Release the pressure from the pilot hydraulic system. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release".Gas pressure is variable with temperature. Check the temperature of the air around the accumulator. In order to check the amount of charge in an accumulator, the accumulator must be at the same temperature as the surrounding air.Note: The temperature of the accumulator may change as the accumulator is being charged due to the expansion or compression of the nitrogen charge. It may be necessary to charge the accumulator in several steps in order to ensure a correct charge.
Table 2
Charge Pressures and Temperatures
Temperature Pressure
-23°C (-10°F)
1495 kPa (217 psi)
-21°C (-5°F)
1516 kPa (220 psi)
-18°C (0°F)
1529 kPa (222 psi)
-15°C (5°F)
1550 kPa (225 psi)
-12°C (10°F)
1564 kPa (227 psi)
-9°C (15°F)
1577 kPa (229 psi)
-7°C (20°F)
1598 kPa (232 psi)
-4°C (25°F)
1612 kPa (234 psi)
-1°C (30°F)
1632 kPa (237 psi)
2°C (35°F)
1646 kPa (239 psi)
4°C (40°F)
1660 kPa (241 psi)
7°C (45°F)
1681 kPa (244 psi)
10°C (50°F)
1694 kPa (246 psi)
13°C (55°F)
1715 kPa (249 psi)
16°C (60°F)
1729 kPa (251 psi)
18°C (65°F)
1750 kPa (254 psi)
21°C (70°F)
1763 kPa (256 psi)
24°C (75°F)
1777 kPa (258 psi)
27°C (80°F)
1798 kPa (261 psi)
29°C (85°F)
1812 kPa (263 psi)
32°C (90°F)
1832 kPa (266 psi)
35°C (95°F)
1846 kPa (268 psi)
38°C (100°F)
1860 kPa (270 psi)
41°C (105°F)
1880 kPa (273 psi)
43°C (110°F)
1894 kPa (275 psi)
46°C (115°F)
1915 kPa (278 psi)
49°C (120°F)
1929 kPa (280 psi) If an accumulator has less than half of the required amount of precharge pressure, the accumulator should be charged. Oil in the accumulator will give an inaccurate precharge reading.
Illustration 1 g00995368
Accumulator (Typical Example) (1) Cap
Illustration 2 g00457381
175-5507 Nitrogen Charging Group (2) Pressure gauge (3) Connection to the nitrogen cylinder (4) Regulator (5) Valve (6) Pressure gauge (7) Pressure regulating screw (8) Valve handle (9) Chuck
Make sure that valve (5) is closed.
Remove cap (1) from the accumulator.
Rotate valve handle (8) on chuck (9) counterclockwise until the valve handle reaches the full out position. Install chuck (9) on the accumulator
Caterpillar parts catalog:
Parts plate Caterpillar catalog:
311C, 311D LRR, 311F LRR, 312C, 312C L, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 312E, 312E L, 313D, 313D2, 313D2 LGP, 314C, 314D CR, 314D LCR, 314E CR, 314E LCR, 315C, 315D L, 316E L, 318B, 318C, 318D...
315C, 315D L, 318B, 318C, 318E L, 319C, 319D, 319D L, 319D LN, 320C, 320C FM, 320C L, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR, 320D RR, 320D2, 320D2 GC, 320D2 L, 320E, 320E L, 32...
311C, 313D2 LGP, 315C, 315D L, 316E L, 318B, 318C, 318D L, 318D2 L, 318E L, 319C, 319D, 319D L, 319D LN, 320B, 320B FM LL, 320B L, 320C, 320C FM, 320C L, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 32...
311, 311B, 311C, 311D LRR, 312, 312B, 312C, 312C L, 312D, 312D L, 313D, 314C, 314D CR, 314D LCR, 315D L, 318C, 318D L, 319C, 319D, 319D L, 319D LN, 320, 320 L, 320B, 320C, 320C FM, 320C L, 320D, 320D ...
311, 311B, 311C, 311D LRR, 312, 312B, 312C, 312C L, 312D, 312D L, 313D, 314C, 314D CR, 314D LCR, 315D L, 318C, 318D L, 319C, 319D, 319D L, 319D LN, 320, 320 L, 320B, 320C, 320C FM, 320C L, 320D, 320D ...
311, 311B, 311C, 311D LRR, 312, 312B, 312C, 312C L, 312D, 312D L, 313D, 314C, 314D CR, 314D LCR, 315D L, 318C, 318D L, 319C, 319D, 319D L, 319D LN, 320, 320 L, 320B, 320C, 320C FM, 320C L, 320D, 320D ...
311, 311B, 311C, 311D LRR, 312, 312B, 312C, 312C L, 312D, 312D L, 313D, 314C, 314D CR, 314D LCR, 315D L, 318C, 318D L, 319C, 319D, 319D L, 319D LN, 320, 320 L, 320B, 320C, 320C FM, 320C L, 320D, 320D ...
311C, 313D2 LGP, 315C, 315D L, 316E L, 318C, 318D L, 318D2 L, 318E L, 319C, 319D, 319D L, 319D LN, 320C, 320C L, 320D, 320D FM, 320D GC, 320D L, 320D LN, 320D LRR, 320D RR, 320D2, 320D2 GC, 320D2 L, 3...
311C, 313D2 LGP, 315C, 315D L, 316E L, 318C, 318D L, 318D2 L, 318E L, 319C, 319D, 319D L, 319D LN, 320C, 320C L, 320D, 320D FM, 320D GC, 320D L, 320D LN, 320D LRR, 320D RR, 320D2, 320D2 GC, 320D2 L, 3...
311, 318C, 319C, 320B, 320B U, 320C, 320C FM, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR, 320D RR, 320N, 321C, 321D LCR, 323D L, 323D LN, 323D SA
315D L, 316E L, 318C, 318D L, 318E L, 319C, 319D, 319D L, 319D LN, 320C, 320C FM, 320C L, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR, 320D RR, 320D2, 320D2 GC, 320D2 L, 320E, 320E L...
315D L, 316E L, 318C, 318D L, 318E L, 319C, 319D, 319D L, 319D LN, 320C, 320C FM, 320C L, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR, 320D RR, 320D2, 320D2 GC, 320D2 L, 320E, 320E L...
2373169
PLATE
321C
321C
320C, 321B, 321C
1737991
PLATE
321C
321C
2841805
PLATE
321C
321C
2841804
PLATE
321C
321C
2841803
PLATE
321C
321C
2449216
PLATE
321C
321C
1321595
PLATE
321C, 330D L, 330D LN, 336D L, 365C, 365C L
321C, 330D L, 330D LN, 336D L, 365C, 365C L
2449154
PLATE AS
321C
321C
2449132
PLATE
321C
321C
7Y9307
PLATE
321C, 345B II
321C, 345B II
2257237
PLATE
321C, 328D LCR
321C, 328D LCR