1991904 SEAL-O-RING Caterpillar parts
305, 307C, 308C, 312B, 318B, 318C, 321B, 325B, 330B, 375
Rating:
Alternative (cross code) number:
CA1991904
199-1904
1991904
CA1991904
199-1904
1991904
EXCAVATOR, MINI HYD EXCAVATOR,
Compatible equipment models: 1991904:
Number on catalog scheme:
6
For full view, you need register
Information:
The air conditioning mode switch is a two pole switch. The switch has two positions that control the operation of the air conditioning. In the automatic position the ECM controls the operation of the air conditioning to maintain a specified cab temperature. In the manual position, the air conditioning is manually engaged. The ECM has two contacts that pertain to this switch, one signals the ECM the switch is automatic mode, the other signals the ECM the switch is in manual mode. These contacts will float to a high voltage state unless the switch is closed to that contact. When the switch closes to a contact, the contact is pulled to a low or ground voltage state.High/Low Pressure Switch
Illustration 5 g06081890
High-pressure switch
Illustration 6 g06081978
Low-pressure switch
Illustration 7 g06082059High/Low pressure switch, used to prevent unwanted high pressure, and low-pressure conditions on the outlet of the A/C compressor. Low-pressure switch, used to prevent unwanted low-pressure conditions on the inlet side of the A/C compressor. Both the high/low and low-pressure sensors prevent operation of the A/C compressor during conditions of overcharge of the refrigerant and undercharge of the refrigerant.The air conditioning low-pressure contact at the ECM monitors the voltage state of the high and low-pressure cutoff switches for the air conditioning. The switches are set up in series from a power source. The switches close and allow power to pass when the pressure in the high pressure and low pressures air conditioning loops is high exceeds the actuation pressure for the switch. If both switches have been actuated, both switches are closed and the ECM contact is pulled to a low or ground voltage state. If either switch has not been actuated, the ECM contact is pulled to a high-voltage state.Evaporator Thermostat Switch
Illustration 8 g06081838The HVAC evaporator temperature sensor is a two-wire passive temperature sensor. The sensor sends an analog signal to the implement ECM indicating evaporator temperature. The sensor is a negative coefficient thermistor. The resistance range for the sensor is 33,650 ohms at −40° C (−40° F) to 18.6 ohms at 150° C (302° F). The sensor is used to determine evaporator temperature.Outputs
Condenser Fan Relays
Illustration 9 g03352416
Relay schematic shows relay in the DE-ENERGIZED position.
The condenser fan relays control the operation of the condenser fans. The relay is activated by the ECM when the air conditioning system is active. When the relay is activated, the relay allows power to flow to the condenser fans. When the ECM has not activated the relay, power is not allowed to flow to the condenser fans.Clutches
HVAC A/C Compressor Clutch
Illustration 10 g03352237
Illustration 11 g03399576
(3) Magnetic clutch and pulley assembly
(4) Coil assembly
(5) Drive plate
(6) Bearing
(7) Compressor shaftThe Implement ECM energizes the air conditioning clutch when the operator requests air conditioning and all the conditions have been met.The compressor is driven by the engine. A belt connects the engine to the clutch and pulley assembly (3). The pulley assembly is on the clutch. The drive plate (5) is fastened to the shaft of the compressor. The clutch and pulley assembly (3) turns on the bearing
Illustration 5 g06081890
High-pressure switch
Illustration 6 g06081978
Low-pressure switch
Illustration 7 g06082059High/Low pressure switch, used to prevent unwanted high pressure, and low-pressure conditions on the outlet of the A/C compressor. Low-pressure switch, used to prevent unwanted low-pressure conditions on the inlet side of the A/C compressor. Both the high/low and low-pressure sensors prevent operation of the A/C compressor during conditions of overcharge of the refrigerant and undercharge of the refrigerant.The air conditioning low-pressure contact at the ECM monitors the voltage state of the high and low-pressure cutoff switches for the air conditioning. The switches are set up in series from a power source. The switches close and allow power to pass when the pressure in the high pressure and low pressures air conditioning loops is high exceeds the actuation pressure for the switch. If both switches have been actuated, both switches are closed and the ECM contact is pulled to a low or ground voltage state. If either switch has not been actuated, the ECM contact is pulled to a high-voltage state.Evaporator Thermostat Switch
Illustration 8 g06081838The HVAC evaporator temperature sensor is a two-wire passive temperature sensor. The sensor sends an analog signal to the implement ECM indicating evaporator temperature. The sensor is a negative coefficient thermistor. The resistance range for the sensor is 33,650 ohms at −40° C (−40° F) to 18.6 ohms at 150° C (302° F). The sensor is used to determine evaporator temperature.Outputs
Condenser Fan Relays
Illustration 9 g03352416
Relay schematic shows relay in the DE-ENERGIZED position.
The condenser fan relays control the operation of the condenser fans. The relay is activated by the ECM when the air conditioning system is active. When the relay is activated, the relay allows power to flow to the condenser fans. When the ECM has not activated the relay, power is not allowed to flow to the condenser fans.Clutches
HVAC A/C Compressor Clutch
Illustration 10 g03352237
Illustration 11 g03399576
(3) Magnetic clutch and pulley assembly
(4) Coil assembly
(5) Drive plate
(6) Bearing
(7) Compressor shaftThe Implement ECM energizes the air conditioning clutch when the operator requests air conditioning and all the conditions have been met.The compressor is driven by the engine. A belt connects the engine to the clutch and pulley assembly (3). The pulley assembly is on the clutch. The drive plate (5) is fastened to the shaft of the compressor. The clutch and pulley assembly (3) turns on the bearing
Caterpillar parts catalog:
Parts seal Caterpillar catalog:
1090, 1190, 1190T, 120G, 1290T, 12G, 130G, 140B, 14G, 1673C, 173B, 183B, 215, 215B, 215C, 215D, 216, 216B, 216B3, 219D, 225, 225D, 226B, 226B3, 228, 229, 229D, 231D, 232B, 235, 235B, 235C, 235D, 236, ...
10 FT, 1190, 1190T, 120G, 120K, 120K 2, 120M, 120M 2, 1290T, 12G, 12H, 12H ES, 12H NA, 12K, 12M 2, 12M 3, 12M 3 AWD, 130G, 1390, 140G, 140H, 140H ES, 140H NA, 140K, 140K 2, 140M, 140M 2, 140M 3, 140M ...
1090, 1190, 1190T, 1290T, 1390, 2290, 2390, 2391, 2491, 2590, 301.5, 302.5, 303, 303.5, 303.5C, 303.5D, 303.5E, 303C CR, 303E CR, 304, 304.5, 304C CR, 304D CR, 304E, 305, 305.5, 305.5D, 305.5E, 305C C...
120M 2, 12M 2, 12M 3, 12M 3 AWD, 140M 2, 140M 3, 140M 3 AWD, 160M 2, 160M 3, 160M 3 AWD, 236B, 236D, 2384C, 242D, 246C, 246D, 2484C, 252B, 256C, 257D, 259D, 262C, 262C2, 262D, 267B, 268B, 272C, 272D, ...
303.5C, 303.5D, 303C CR, 303E CR, 304, 304C CR, 304D CR, 304E, 305, 305.5D, 305.5E, 305C CR, 305D CR, 305E, 307, 307B, 307C, 307D, 308C, 308D, 308E, 311, 311B, 311D LRR, 311F LRR, 312, 312B, 312C, 312...
307B, 307C, 307D, 311B, 312B, 312B L, 312C L, 313B
307B, 307C, 307D, 308C, 308D, 311B, 311C, 311D LRR, 312C, 312C L, 312D, 312D L, 312D2, 314C, 314D LCR, 315C, 315D L, 318B, 318C, 319C, 319D, 320B, 320C, 320C FM, 320C L, 320D, 320D FM, 320D FM RR, 320...
307, 307B, 307C, 307D, 308D, 308E CR, 311, 311B, 311C, 311D LRR, 311F LRR, 312, 312B, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 312E, 312E L, 313D, 313D2, 313D2 LGP, 314C, 314D LCR, 315, 315D L, 316E L,...
303.5E, 303E CR, 304E, 305, 305.5E, 305E, 307D, 308D, 308E CR, 308E SR, 320C, 330C L, 330D L, 345B II, 345C, E200B, E240, E240C, E300, E300B, E650, E70B, EL240B, H110E S
318B, 318C, 319D L, 319D LN, 320B, 320B FM LL, 320C, 320C FM, 320D, 320E, 320E RR, 322, 322B, 322C, 324D, 324D L, 324E, 324E L, 324E LN, 325B, 325C, 325C L, 326D L, 328D LCR, 330C L, 345B II, 345C, 37...
303.5C, 303.5D, 303.5E, 303C CR, 304.5, 304D CR, 304E, 305.5, 306, 308E, 308E CR, 308E SR, 308E2 CR, 318B, 318C, 319D L, 319D LN, 320B, 320B FM LL, 320C, 320C FM, 320D, 320E, 320E RR, 322, 322B, 322C,...
318B, 318C, 319D L, 319D LN, 320D, 320D FM, 320D L, 323D L, 323D LN, 323D SA, 324D, 324D L, 325D, 325D L, 328D LCR, 329D, 329D L, 345B II, 345C
318B, 318C, 319D L, 319D LN, 320D, 320D FM, 320D L, 323D L, 323D LN, 323D SA, 324D, 324D L, 325D, 325D L, 328D LCR, 329D, 329D L, 345B II, 345C
318B, 318C, 319D L, 319D LN, 320D, 320D FM, 320D L, 320D2, 320D2 L, 320E LN, 323D L, 323D LN, 323D SA, 323D2 L, 323E L, 324D, 324D FM, 324D L, 324E, 324E L, 324E LN, 325D, 325D L, 326D L, 328D LCR, 32...
318B, 318C, 320C, 320C FM, 320C L, 321B, 321C, 322C, 325C L, 330D L
311B, 318B, 320B FM LL, 320N, 322B, 325 L, 325B
307B, 307C, 307D, 308C, 308D, 311B, 311C, 311D LRR, 312C, 312C L, 312D, 312D L, 312D2, 314C, 314D LCR, 315C, 315D L, 318B, 318C, 319C, 319D, 320B, 320C, 320C FM, 320C L, 320D, 320D FM, 320D FM RR, 320...
307C, 307D, 311B, 311C, 312C L, 315, 315C, 318B, 318C, 320C, 320C L, 320D, 320D L, 320D LRR, 320D RR, 322, 322B L, 322B LN, 322C, 323D L, 324D, 324D L, 325B L, 325C, 325D, 325D L, 329D, 329D L, 330, 3...
1772645
SEAL-O-RING
315B, 315C, 318B
315B, 315C, 318B
303.5C, 303.5D, 303.5E, 303C CR, 304C CR, 304D CR, 304E, 305.5D, 305.5E, 305C CR, 305D CR, 305E, 307, 307B, 311B, 312B, 315B, 318B, 320B, 320B FM LL, 320N, 322 FM L, 322B, 322B L, 322B LN, 325, 325 LN...
311C, 313D2 LGP, 315C, 315D L, 316E L, 318B, 318C, 318D L, 318D2 L, 318E L, 319D, 319D L, 319D LN, 320 L, 320B, 320B L, 320C, 320C L, 320D, 320D FM, 320D GC, 320D L, 320D LN, 320D LRR, 320D RR, 320D2,...