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Western Star 4700 Maintenance Manual

Your name. Your email. Your phone number Please include your area code.Page of Go. Quick Links. Table of Contents. Channel Ave. Portland, OR Printed in U. EZWiring can also be ac- cessed from within PartsPro. Page 5 Field Service Campaigns Field service campaigns are concerned with non-safety-related service work or replacement of parts. Page 7 Heater and Air Conditioner Page 10 Use Service Schedule I severe service maintenance intervals for vehicles that operate under severe conditions, such as extremely poor roads, heavy dust accumulation, extreme climate, frequent short distance travel, construction-site operation, logging, city operation, or farm operation.

Page 15 Numbers in this table are reference numbers match- operations listed in the "Pretrip and Post-Trip Inspec- ing those in the text of this manual. Page 17 If equipped with an oil-coalescing desiccant cartridge, replace the cartridge once a year, regardless of mileage. Otherwise use the M4 maintenance interval.

Page Initial Maintenance im Operations NOTE: Numbers in this table are reference numbers this table, perform all daily and weekly maintenance matching those in the text of this manual. Page M1 Maintenance Interval Operations Table If equipped with an oil-coalescing desiccant cartridge, replace the cartridge once a year, regardless of mileage.

Page M2 Maintenance Interval Operations Table Intervals vary by transmission model, application, lubricant, and use. Contact Allison to determine the precise interval s for the transmission model and lubri- cant used on the vehicle. Page Noise Emission Controls Maintenance 5.

The removal of the fan shroud. The removal of, or rendering inoperative, en- Western Star parts.

Wiper control on the M2

If other than genuine Western gine exhaust components, including the ex- Star parts are used, for replacement or repair of haust pipe clamping. Page 27 Safety Precautions Page Engine Belt Inspection Fig. If the Fig.Forums New posts Search forums.

western star windshield wiper problems

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Thread starter Start date Jun 30, Dumb question so give me a break. I notice there is a box mounted to my Detroit engine. Is that the ECM? Also, behind my gauge panel is another computer board. So, I'm assuming the ECM is mounted on the engine and the board behind the gauges controls the delay wipers, cruise and other stuff? Why I'm asking. My cruise keeps shutting off and turning back on. My windshield wipers also do not turn off sometimes and my intermittent wipers don't work as they should.

I'm first going to check out the board behind the gauges and try re-seating the chips and maybe looking for loose ground connections and other problems. The box on the side of the engine is the engine ecm. It's unrelated to your issues but I'd be curious what your wiring looks like at the point where the harness comes off the ecm and makes both the sharp bend up and the the sharp bend back.

You'd have to take a couple brackets off the get inside it. Every place there was a sharp bend, the harness loom covering wore through my wire insulation. So bad I had to replace it all. The wiper issue is the switch itself most likely. What truck have you got? My century has fits with cruise because of the brake switch.

Truck is a Western Star.If you can't see the road, it's virtually impossible to safely operate a vehicle. The windshield wipers are specifically engineered to help clear rain, snow, dirt, and other debris from the windshield. If the wiper blades are the arms and hands of your car's wiper system, the wiper motor would definitely be the heart.

In order to move back and forth across the windshield, the windshield wipers are controlled by the windshield motor. When you activate the windshield switch on your turn signal indicator or other control arm next to your steering wheel, it sends a signal to the motor and operates the wipers at different speeds and duration. When the wiper blades don't move after turning on the switch, it's often caused by a malfunction in the wiper motor.

Although the likelihood of having a problem with your windshield wiper motor is rare, there are a few warning signs that will alert you that the wiper motor is damaged or needs to be replaced.

Today's modern cars, trucks, and SUVs have programmable wiper blades that can operate at multiple speeds and different delays. If you activate the wiper switch to a fast speed or high setting and the wiper blades move slower than they should, it may be caused by a problem with the wiper motor.

Sometimes the mechanical components inside the motor will be clogged with debris, grime, or other particles. If this happens, it can impact the speed of the motor. If you experience this type of problem with your wiper blades, it's a smart idea to contact a local ASE certified mechanic as soon as possible, so they can inspect the wiper motor and other components that may be causing this problem.

On the opposite side of the equation, if you activate the wiper switch and try to change speeds or settings, but the wipers move the same all the time, it may also be a problem with the wiper motor.

The wiper motor receives a signal from the wiper module, so the issue may be with the module as well. When you notice this symptom, before you decide to replace the wiper motor, make sure you work with a local ASE certified mechanic so they can determine if the problem is with the motor or module. You'll save a lot of money, time, and trouble by contacting the mechanic first. If you've turned on your wiper switch and the blades don't move at all or you don't hear the motor working, it's very likely that the motor is damaged or that an electrical problem exists.

Sometimes it can be caused by a blown fuse that operates the wiper motor. However, a fuse will only burn out if there is an electrical overload of power to that particular circuit. In any case, a more serious problem exists which should inspire you to contact a mechanic to diagnose what is causing the electrical issue and repair it so it does not damage other components on your vehicle.

When you turn the wiper blades off, they are supposed to move into a "parked" position. Typically this means the wiper blades will return to the bottom of your windshield and lock into place.

This is not always the case, so you should check your owner manual to verify that your car, truck, or SUV has this option. However, if you turn your wiper blades off and the blades stay in the same position on your windshield, blocking your view, this is typically a problem with the motor and often results in needing to replace the windshield washer motor.

Common GM Wiper Problem

The windshield wiper motor is usually not a part that is repaired. Due to the complexity of the device, most windshield wiper motors are replaced by certified ASE mechanics. A new wiper motor can last a very long timeand with routine service, you should never experience a problem with your wiper blades.

If you notice any of the above warning signs, contact a local ASE certified mechanic so they can diagnose the precise mechanical fault and repair it as soon as possible. The most popular service booked by readers of this article is Vehicle Body Mechanical Inspection. Our certified mobile mechanics make house calls in over 2, U. Fast, free online quotes for your car repair. Schedule Vehicle Body Mechanical Inspection. Service Area. Average rating fromcustomers who received a Vehicle Body Mechanical Inspection.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

It only takes a minute to sign up. I just purchased a used Dodge Ram 5. I "tested" the wipers before purchase and they "Worked".

Sometimes when they are on ANY setting they wipe super fast. Other times they wipe as expected, though the super fast is by far the prevalent symptom. Today they began stopping mid-wipe and I had to turn them off and on again at the wheel. I am not a motorhead or person of knowledge when it comes to vehicles and am not sure where to start troubleshooting. I suspect it isn't a fuse as it works most of the time, albeit incorrectly.

I was reading here and here and I have both symptoms at times but my vehicle isn't the same don't know if that matters. Any ideas of how to troubleshoot the root cause of my wiper malfunctioning? Wiper Module - The wiper pivot shafts are the only visible components of the wiper module. The wiper module includes the wiper module bracket, four rubber-isolated wiper module mounts, the wiper motor, the wiper motor crank arm, the two wiper drive links, and the two wiper pivots.

The wiper module cannot be adjusted or repaired. If any component of the module is faulty or damaged, the entire wiper module unit must be replaced. The wiper motor speed is controlled by current flow to either the low speed or the high speed set of brushes. The park switch is a single pole, single throw, momentary switch within the wiper motor that is mechanically actuated by the wiper motor transmission components.

The park switch alternately opens and closes the wiper park switch sense circuit to ground, depending upon the position of the wipers on the glass. This feature allows the motor to complete its current wipe cycle after the wiper system has been turned Off, and to park the wiper blades in the lowest portion of the wipe pattern. The automatic resetting circuit breaker protects the motor from overloads.

The wiper motor crank arm, the two wiper linkage members, and the two wiper pivots mechanically convert the rotary output of the wiper motor to the back and forth wiping motion of the wiper arms and blades on the glass.

There was no "best" way to troubleshoot this issue that I could see. Ended up taking it to a mechanic and he plugged in a new wiper motor to see if that was it and turns out it was. Short of having spare parts lying around to plug and check, this isn't easy to troubleshoot.Whether you're driving in a torrential downpour or simply need to clear those bugs off the windshield, having the ability to slow down or speed up your windshield wipers comes in quite handy. This operation is completed thanks to the intermittent wiper relay ; an electrical switch that sends a predetermined setting to the wiper module to power the wiper motor.

When all of the components involved in the windshield wiper blades work correctly, the system is very convenient. However, when one part malfunctions, it can cause potential safety concerns.

One of the most common parts to fail is the intermittent wiper relay switch. The electronic relays that are installed in today's cars, trucks and SUV's have to operate in very hot and grueling conditions or are subject to constant abuse.

The wiper relay is unique in that it's found inside the wiper control handle which often has selector switches giving drivers multiple settings for their windshields. Over a period of time, this relay can be damaged — which will impact the operation of the windshield wiper system and in some cases, render it useless. When the intermittent wiper relay begins to fail or is wearing outit will display a few warning signs to the driver.

western star windshield wiper problems

In order to reduce the potential of damage to other mechanical components, it's important to be alert to these symptoms and take proactive measures to have the intermittent wiper relay replaced if needed by a professional mechanic.

Listed below are a few of these warning signs. One of the quickest indicators that a problem exists with the intermittent wiper relay is when the wipers are not intermittent and only work at one speed. The relay switch sends an electrical signal to the module that controls the operation of the wiper motor and gears inside.

When the relay is faulty, the windshield wipers will only work at the same speed that the last relay signal was sent. In layman's terms, if you had your windshield wipers on the slow speed the last time they were active, and you turn them on again under a different setting, the relay switch should send that updated information to the module. If you make a change in the settings and the wipers don't react, it's most likely due to a malfunction in the intermittent wiper relay.

This can lead to a potentially unsafe driving situation as sometimes we encounter weather conditions that require the use of the intermittent switch. If you notice this problem on your windshield wipers, please contact a certified mechanic as soon as possible. Since the intermittent wiper relay is responsible for sending signals to the module, it's also possible that it could send an incorrect signal when it is malfunctioning.

Most of the time, this signal will be to the motor to cease operation of the wiper blades.

western star windshield wiper problems

This is very rare, but is often attributed to a problem in the intermittent wiper switch or controls. Similar to the issue above, if you notice that your wiper blades are operating at a different speed or intermittent setting than you selected, it's a good indication that the relay is damaged and needs to be replaced.

This is also a symptom that you don't want to avoid as it may cause the wiper blade motor to overheat and break prematurely. In some instances, you may notice that there is a strange humming noise when trying to operate the wipers on the car. This is usually caused by the wiper motor not getting the power that it needs due to a bad relay.Forums New posts Search forums. Media New media New comments Search media.

Members Registered members Current visitors New profile posts Search profile posts. Log in Register. Search titles only. Search Advanced search…. New posts. Search forums. Log in. For a better experience, please enable JavaScript in your browser before proceeding. Wiper control on the M2. Thread starter redytrk Start date Jun 11, I am told by a FL Tech that I am not alone in this problem.

Almost from day one with this truck, wipers would come on for no reason. Usually after a turn signal was activated. Three switches were installed during the Warranty period. Now that I am paying the bills I have found a new solution. Just pull out the plug beneath the turn signal, and spray both parts of the connection with Electronic Cleaner. I get mine at NAPA. I need to use it every few months. Be shure the Ignition switch is OFF.

Last edited: Jun 11, After you clean it put in new di-electric grease. We can't wait to try this. We are SICK of the wipers coming on at odd times. As you mentioned, it has been a problem from day one and we never know when they will suddenly come on.

Thanks for the tip on this.


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