Question about Caterpillar American Construction Equipment 1:87 Scale

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Accumulator charging valve

Dear sir
I have 988B caterpillar wheel loader 50W06041 powered by 3408 engine. And I have a problem with the hydraulic system the problem is the bucket does not raise when the engine is on low idle until I push on the brake padle then it raises. But it raises normaly when the engine is on high idle. I have an other wheel loader the same kind of it and I disassmbled the accumulator charging valve of it and installed it on the loader that has the problem and it worked out perfectly. So I knew the problem with the accumulator chargeing valve. So I brought a new charging valve and installed it on the the loader but it did not work out it gave the same problem that the loader has. and I tryed other four valves second hand but they did not work as well and the loader has the same problem. So my equestion is there possible problem with the valves them selves?
thank you
Ashref

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This sound weird but the small pump on the back of your steering pump is the brake and pilot system supply. It is the possible source of your problem. Check for flow from the pump. At low idle there may be low flow.

Posted on Jul 30, 2009

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No heat in cab on caterpillar 299C skid loader


Look and be sure heater shut off valves on engine head and block are open. Then be sure water pump belt is on and not broken. Check this then go from there.

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Caterpillar Fault Codes


CID code Name
1 Injector? 1
2 Injector, cylinder number 2
3 Injector number 3
4 Injector number 4
5 Injector, cylinder number 5
6 Injector, cylinder number 6
7 Injector number 7
8 Injector number 8
9 Injector number 9
10 Injector number 10
11 Injector number 11
12 Injector number 12
13 Injector number 13
14 Injector number 14
15 Injector number 15
16 Injector number 16
17 The fuel shut-off valve
18 The fuel control valve
19 Bypass valve accelerator
20 Device change timing of fuel injection
21 Position Sensor Engine
22 Sensor fuel injection advance
23 Drive Racks
24 position sensor rail
27 is a variable geometry turbocharger number 1
28 Drive with variable geometry turbocharger number 2
41 Power ECU (electronic control unit) 8 V DC
42 Valve inclusion nozzles
70 contact with the parking sensor
71 Timer stop idling
75 Oil temperature sensor circuit hydraulic steering system
The pressure sensor 81 at the inlet trap foreign particles
82 Pressure Sensor pnevmozapuska
84 speed sensor
91 Accelerator pedal position sensor
94 Pressure Sensor fuel pumping
95 The differential pressure sensor on the fuel filter
96 Fuel level sensor
98 Oil level sensor in the engine
99 The differential pressure sensor on the engine oil filter
100 Oil Pressure Switch Engine
101 pressure sensor crankcase gases
102 turbo pressure sensor
104 Oil pressure turbocharger
105 temperature sensor intake manifold
106 sensor input air pressure
Pressure sensor 109 of coolant downstream of the engine
110 Coolant Temperature Sensor Engine
111 level sensor, engine coolant
The differential pressure sensor 112 to filter engine coolant
124 gearbox oil level
126 differential pressure sensor on the oil filter transmission
127 Oil Pressure Switch gearbox
138 Mode Switch low traction
139 Solenoid tip ago
140 Solenoid tip forward
141 Eco Mode Switch
142 position sensor door to clean the radiator
143 contact pressure sensor control unit neutral
144 horn relay reverse
145 power supply circuit 12
146 Mode Switch hitch
147 pressure sensor lock-up clutch
148 pressure sensor in the hydraulic stroke
149 Three-way solenoid stabilization system of the implement when driving
150 Speed Sensor trambovatelya
151 Solenoid trambovatelya
152 diagnostic lamp control systems course
153 speed sensor right drive motor
154 RPM Sensor left actuator motor
155 solenoid switching stroke
156 Solenoid right turn in reverse (electronic display)
157 Solenoid left turn in reverse (electronic display)
158 Solenoid right turn forward direction (electronic display)
159 Solenoid left turn forward direction (electronic display)
160 Relay working equipment paver
161 brake sensor (chassis) pedal
162 Sensor Steering Wheel
The steering angle sensor 163 rotation
164 Pressure Sensor inclusion nozzles
167 Sensor charging voltage of the alternator
168 Electric system
171 of the ambient air temperature sensor
172 temperature sensor in the intake manifold
174 Fuel temperature sensor
175 Temperature Sensor Engine oil
177 oil temperature sensor Gearbox
190 RPM Sensor engine crankshaft
191 sensor output speed gearbox
248 data channel of Caterpillar
249 data channel J1922 SAE (Society of Automotive Engineers)
250 data channel J1708 / J1587 SAE (Society of Automotive Engineers)
Block 252 calibration
253 Personal chip control unit
254 electronic control unit
256 Map adjusting engine performance
257 Level detonation
258 sensor crank angle
259 set via software point fuel injection
260 oxygen sensor in the exhaust gas
261 the fuel injection timing calibration
262 circuit sensor supply 5 V
The power circuit 263 digital sensors (8 or 12)
264 pedal revolutions reduction
265 Input circuit stopping the engine, user-defined
266 Input circuit dry scroll engine (without fuel injection)
267 Chain input remote control signal Safe Stop engine
268 Error programmed parameter
269 circuit sensor supply
Code 270 cable computerized monitoring system (CMS)
271 Sound the alarm
272 sensor has exceeded the allowable turbo
273 pressure sensor at the outlet of the turbocharger
274 atmospheric pressure sensor
275 pressure sensor at the entrance of the right turbocharger
Pressure transducer 276 at the input of the left turbocharger
277 sensor calibration injection timing
278 The indicator light turn on the automatic control of engine speed (AESC)
279 coolant temperature in the intercooler front section
280 temperature sensor gear
281 The indicator light necessary Engine
282 Light indicator exceeding the permissible engine speed
283 Indicator Light air filter
284 Radio on EMS (electronic control system) (the signal of the engine)
285 overheating indicator light, engine coolant
286 Indicator light low oil pressure
287 Miniature digital output? 7
288 Miniature digital output? 8
289 Fuel pressure - before the fuel filter
290 pressure sensor in the pump drive engine cooling fan
The solenoid 291 engine cooling fan
292 solenoid hydraulic oil cooling fan
293 power analog output? 3
294 power analog output? 4
The control unit 295 hydraulic excavator heavy-duty
296 gearbox control unit
297 all-wheel drive system control
298 The probe brake pedal
299 position sensor gear lever
300 The primary windings of ignition coils
301 The primary winding of the ignition coil? 1
302 The primary winding of the ignition coil? 2
303 The primary winding of the ignition coil? 3
304 The primary winding of the ignition coil? 4
305 The primary winding of the ignition coil? 5
306 The primary winding of the ignition coil? 6
307 The primary winding of the ignition coil? 7
308 The primary winding of the ignition coil? 8
309 The primary winding of the ignition coil? 9
310 The primary winding of the ignition coil? 10
311 The primary winding of the ignition coil? 11
312 The primary winding of the ignition coil? 12
313 The primary winding of the ignition coil? 13
314 The primary winding of the ignition coil? 14
315 The primary winding of the ignition coil? 15
316 The primary winding of the ignition coil? 16
317 load cell
318 Right knock sensor
319 Left knock sensor
320 RPM Sensor / injection timing
321 Key switch reset / diagnostic confirmation
322 engine stop switch
323 The indicator light engine stop
324 Alarm lamp
325 detonation caused by the ignition system
Detonation System 326
327 Wrong number of knock sensors
328 Wrong number of cylinders of the engine
329 Error Link
330 Login with contact sensor propane content
331 Ignition Switch
332 keyboard switch
333 switch alarm
334 Reserve output
335 solenoid screw scraper
336 switch engine control
337 Remote Switch emergency stop
338 Relay pre-lube pump motor
339 contact pressure transducer pre-lube the engine
340 solenoid shut-off air
The solenoid 341? 4 warm-hydraulic distributor
342 Auxiliary speed sensor engine crankshaft
343 injector NOx catalyst in the exhaust gas
344 Relay injection pump converter of nitrogen oxides in exhaust gases
Pressure sensor 345 of the injection NOx catalyst in the exhaust gas
346 Relay stabilization system of the implement when driving
347 solenoid feed control (working volume) motor hydrostatic transmission
348 lock switch gearbox
Solenoid 349 gearbox synchronization
350 position sensor rod lift
351 position sensor rod misalignment
352 Sensor lift lever (in the cockpit)
353 sensor lever skew (in the cockpit)
The solenoid 354? 1 lift
The solenoid 355? 1 lowering
The solenoid 356? 1 unloading
357 Solenoid No. 1 return
358 Drive pressurization of the control loop hydraulic system work equipment
359 solenoid locking lifting
360 solenoid lock lowering
The electromagnet 361 tilt lock to download
362 solenoid control the fan speed of the engine
363 Drive stabilization system of the implement when driving
364 pressure sensor piston cavity lift cylinder
365 switch for limiter
366 contact gauge semiautomatic recess
367 Switch stabilization system of the implement when driving
368 switch, automatic / manual mode transmission
369 Login with shift indicator on the gearbox
370 Solenoid floating position arrows
Solenoid 371 beep
372 solenoid opening bucket (for excavator shovel)
373 solenoid closing bucket trucks through the hinged bottom (for excavator shovel)
374 Solenoid swing brake
375 Solenoid swing brake
376 Warning stroke
377-way solenoid brake
378 solenoid automatic lubrication system of the machine
379 Pressure Sensor automatic machine lubrication
380 contact pressure transducer modulation shift gearbox
381 Contact neutral position sensor lift lever (in the cockpit)
382 lever position sensor coupling
383 position sensor coupling
384 shifter
385 contact sensor neutral position tilt (in the cockpit)
386 solenoid lifting hitch
387 Solenoid lowering hitch
388 Contact line solenoid coupling
389 The probe neutral auxiliary lever
The solenoid 390 controlling the flow of hydraulic oil through the forward clutch
The solenoid 391 controlling the flow of hydraulic oil through the reversing
392 solenoid oil supply
The solenoid 393 to drive the front wheels
The solenoid 394 controlling the flow of oil through the drive motor
395 solenoid switch actuator pressure of the front wheel
396 Light on lamp-wheel drive (AWD)
397 contact pressure transducer feed pump
398 pressure sensor in the front wheel drive
399 sensor to the control lever-wheel drive (AWD)
400 The secondary windings of ignition coils

More Fault Codes HERE Caterpillar DTC

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How do I change the controls on a John Deere 200 excavator to Caterpillar controls?


talk with a hydraulic engineering shop to find the problems associated with changing the valve bodies over

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Black smoking for a caterpillar wheel loader 988b


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Apr 14, 2013 | Cars & Trucks

1 Answer

Hard of starting


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Mar 01, 2013 | Caterpillar 1978 3406, 3408, 3412...

1 Answer

1998 dodge dakota 5.2L V8, I have 2nd and 3rd gear only with automatic transmission.


In the 1998 Dodge Dakota 5.2L V8 if you have only 2nd and 3rd gear with the auto transmission, the solenoid inside for shifting down to 1st gear is not functioning correctly.

A complete transmission rebuild is indicated in this situation, where all of the clutches and solenoids that are bad are replaced.

This involves tearing down the transmission after removing it from the vehicle, and; rebuilding it from the ground up.

Try to find a local transmission repair shop where they are certified to do this kind of work.
----
A basic description of the problem follows:
Servos/Accumulators The servos are hydraulic pistons and cylinders. They resemble the hydraulic actuators used on many other machines, such as bulldozers. Hydraulic fluid enters the cylinder, under pressure, and forces the piston to move to engage the band or clutches.
Servo operation tccs7015.gif

The accumulators are used to cushion the engagement of the servos. The transmission fluid must pass through the accumulator on the way to the servo. The accumulator housing contains a thin piston, which is sprung away from the discharge passage of the accumulator. When fluid passes through the accumulator on the way to the servo, it must move the piston against spring pressure, and this action smoothes out the action of the servo.
Hydraulic Control System The hydraulic pressure used to operate the servos comes from the main transmission oil pump. This fluid is channeled to the various servos through the shift valves. There is generally a manual shift valve, which is operated by the transmission selector lever, and a shift valve for each up shift the transmission provides.
Most automatic transmissions are electronically controlled; electrical solenoids are used to control the hydraulic fluid. The shift solenoids are regulated by an electronic control module. Shift timing is regulated through sensor feedback information provided to the electronic controller.
On older transmissions there are two pressures that control the shift valves. One is the governor pressure which is affected by vehicle speed. The other is the modulator pressure which is affected by intake manifold vacuum or throttle position. Governor pressure rises with an increase in vehicle speed, and modulator pressure rises as the throttle is opened wider. By responding to these two pressures, the shift valves cause the up shift points to be delayed with increased throttle opening to make the best use of the engine's power output.
Older transmissions also make use of an auxiliary circuit for downshifting. This circuit may be actuated by the throttle linkage, vacuum that actuates the modulator, or by a cable or solenoid. It applies pressure to the downshift surface on the shift valve or valves.
The transmission modulator also governs the line pressure, used to actuate the servos. In this way, the clutches and bands will be actuated with a force matching the torque output of the engine.
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Aug 17, 2010 | 1998 Dodge Dakota

1 Answer

I have a 1997 Dakota 121,000 miles and replace the transmission 15,000 miles ago. I bought this from Ebay. Worked fine till now and it won't shift into low when you stop and doesn't shift to over drive...


prev.gif next.gif DRIVE TRAIN
  • Servos/Accumulators The servos are hydraulic pistons and cylinders. They resemble the hydraulic actuators used on many other machines, such as bulldozers. Hydraulic fluid enters the cylinder, under pressure, and forces the piston to move to engage the band or clutches.
    Servo operation tccs7015.gif

    The accumulators are used to cushion the engagement of the servos. The transmission fluid must pass through the accumulator on the way to the servo. The accumulator housing contains a thin piston, which is sprung away from the discharge passage of the accumulator. When fluid passes through the accumulator on the way to the servo, it must move the piston against spring pressure, and this action smoothes out the action of the servo.
    Hydraulic Control System The hydraulic pressure used to operate the servos comes from the main transmission oil pump. This fluid is channeled to the various servos through the shift valves. There is generally a manual shift valve, which is operated by the transmission selector lever, and a shift valve for each up shift the transmission provides.
    Most automatic transmissions are electronically controlled; electrical solenoids are used to control the hydraulic fluid. The shift solenoids are regulated by an electronic control module. Shift timing is regulated through sensor feedback information provided to the electronic controller.
    On older transmissions there are two pressures that control the shift valves. One is the governor pressure which is affected by vehicle speed. The other is the modulator pressure which is affected by intake manifold vacuum or throttle position. Governor pressure rises with an increase in vehicle speed, and modulator pressure rises as the throttle is opened wider. By responding to these two pressures, the shift valves cause the up shift points to be delayed with increased throttle opening to make the best use of the engine's power output.
    Older transmissions also make use of an auxiliary circuit for downshifting. This circuit may be actuated by the throttle linkage, vacuum that actuates the modulator, or by a cable or solenoid. It applies pressure to the downshift surface on the shift valve or valves.
    The transmission modulator also governs the line pressure, used to actuate the servos. In this way, the clutches and bands will be actuated with a force matching the torque output of the engine.
  • Jul 14, 2010 | Dodge Dakota Cars & Trucks

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