MacDon M155 Operator's Manual page 447

Symptom Problem
Incorrect timing
Engine oil viscosity too high
Intake air restriction
Clogged fuel filter
Lack of power
High back pressure
Improper type of fuel
High or low engine
temperature
Improper valve clearance
Faulty injectors
Engine
temperature below Defective thermostat
normal
Engine overheated
Warning alarm
Low engine oil pressure
sounds
Low transmission oil pressure
147649
TROUBLESHOOTING
Solution
Contact Dealer.
Use recommended oil.
Service air cleaner.
Replace primary fuel filter, and
if necessary, replace secondary
fuel filter.
Clean out or replace muffler.
Use proper fuel.
Remove and check thermostat.
Contact Dealer.
Remove and check thermostat.
Check coolant level.
Check thermostat.
Check oil level.
431
Section
Contact Dealer
8.2.3 Lubricants,
Fluids, and System
Capacities, page
466
Air Intake System,
page 337
Maintaining Fuel
Filters, page 346
Exhaust System,
page 364
8.2.2 Fuel
Specifications,
page 465
Contact Dealer
Checking Coolant
Level, page 354
Contact Dealer
Checking Engine
Oil Level, page
335
Checking and
Filling Hydraulic
Oil, page 401
Revision A