NMC-WOLLARD 2021Truax Blvd., Eau Claire, WI 54703, Phone (715) 835-3151, Fax (715) 835-6625
M100 Tow Tractor Manual No. 46052
PAGE 4
CHAPTER 2 MAINTENANCE
2 TROUBLESHOOTING
10.
2.4 DIAGNOSTICS, STEERING AND BRAKES
Use Table 2.4 for assistance in diagnosing brake problems.
2.4.1 Power System Test
To determine if the pump and booster are operating properly, perform the
following test:
hydraulic pressure in booster.
2. Depress pedal and hold with light pressure, then start engine.
3. If power section is operating properly, the pedal will fall slightly and then
hold. Less pressure will be needed to hold pedal down to this position. You
may now wish to perform the leak test.
4.
OK, check drive belt tension and condition and repair as necessary. If OK,
tests and checks are OK, replace the booster.
2.4.2 Hydraulic Leak Test
1. First perform the Power System Test.
2. Thoroughly clean all hydraulic system (steering and braking) components.
3. With hydraulic system at normal operating temperature and engine at
medium idle speed, apply heavy brake pedal force (100 lbs. maximum) for
no more 5 seconds at a time.
4.
for leaks. Perform repairs as required.
5. If no leaks are found, depress and release brake pedal several times, then
hold with medium pressure (25 to 35 lbs.)
• If pedal does not fall away, hydraulic brake system is not leaking.
• If pedal falls away, the hydraulic brake system is leaking. Check for
external
• leakage at wheel cylinders, calipers, and brake lines and hoses.
• If there is no external leak, there may be an internal leak, such as in
the master cylinder.
AUGUST 31, 2008
To Next Page
Loading...
