- The problem
- The pitman arm retaining nut may not have been torqued to manufacturer specifications. This could result in inadequate retention of the nut at the output shaft, allowing the pitman arm to become loose.
- The fix
- Dealer will inspect and retorque pitman arm, if necessary, at no cost to owner.
Vehicle safety record
1977 Mack RWL Problems, complaints & recalls
No owner complaints about the 1977 Mack RWL have been filed with NHTSA. It is covered by 4 recalls, the latest in June 1979 for the linkages.
NHTSA data checked
CAbout as many problems as a typical RWL year, for its age
- Complaints
- 0
- Recalls
- 4
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Deaths
- 0
1977 Mack RWL recalls 4
Recall repairs are free. Your dealer fixes them whether or not you bought the car there - check your VIN at nhtsa.gov/recalls to see if yours is done. What to do
- The problem
- A short circuit could occur due to chafing or wire disconnection in the box.
- The fix
- The wiring in the sleeper box will be corrected, free of charge.
- The problem
- Delays of up to about 2 seconds may exist in the brake application times to the brakes on the bogie axles in the presence of certain types of wheel speed sensor signal discontinuities or distortions that may occur as a result of sensor wire failure. This constitutes a non-compliance to federal motor vehicle safety standard no. 121, "Air brake systems".
- The fix
- Dealer will install new wheel speed sensors that incorporate improved wiring and the present bogie anti-wheel lock system will be changed to an axle-to-axle system for improved reliability.
- The problem
- The possibility exists that the aluminum engine rear support brackets may fail due to metal fatigue. This type of failure would allow the engine and transmission assembly to dislocate downward. This will result in throttle control loss with the engine operating continuously in the mid to upper range of the governed speed range.
- The fix
- Dealer will inspect and, if necessary, replace aluminum support brackets with brackets made from ductile iron for increased strength.
What owners say
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No complaints about the 1977 Mack RWL yet
No owner has filed a complaint about this vehicle with NHTSA. If yours has a problem, share it here and report it to NHTSA.
Mack RWL: every year compared
All RWL yearsQuestions about the 1977 Mack RWL
Does the 1977 Mack RWL have any recalls?
Yes - NHTSA lists 4 recalls for the 1977 Mack RWL: linkages (June 1979); wiring (October 1978); interconnecting assembly(wiring) (October 1978); engine (August 1978). Recall repairs are free at any authorized dealer. Enter your VIN at nhtsa.gov/recalls to see whether yours has been fixed.
How many complaints has the 1977 Mack RWL had?
None have been filed with NHTSA so far.
Is the 1977 Mack RWL a reliable vehicle?
Its Safety Index is 50 out of 100 (grade C: about as many problems as a typical Mack RWL year, for its age). The index weighs complaints, crashes, fires, injuries, deaths and recalls against how long the vehicle has been on the road, compared with the same model's other years. It is not a measure of every repair - read the complaints and owner experiences, and have any used vehicle inspected before you buy.
What should I do if my 1977 Mack RWL has a problem?
If it is a safety problem, stop driving it if it is unsafe and contact your dealer. Report it to NHTSA at nhtsa.gov/report-a-safety-problem - enough reports start investigations and recalls - and share your experience here so other owners know what to look for.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked . Complaints are owners' own reports and are not verified. How we use the data