Oil Pressure Switch; Relief Valve And Spring - Zenith ZPP 416 Service Manual

LUBRICATION SYSTEM
3. Check the tip clearance on the pump roter.

RELIEF VALVE AND SPRING

1. Check sliding condition of the relief valve inserted in
the front case.
2. Inspect for distorted or broken relief valve spring.
Standard value
Free height : 46.6 mm (1.8346 in.)
Load : 6.1 kg/40.1 mm (13.42 lb/1.578 in.)
ZENITH POWER PRODUCTS - 416
EDKD206A
EDKD205A
OIL PRESSURE SWITCH (Normally Closed type STD.)
1. Use an ohmmeter to check the continuity between the
terminal and the body. If there is no continuity, replace
the oil pressure switch.
2. Check the continuity between the terminal and the
body when the fine wire is pushed. If there is con-
tinuity even when the fine wire is pushed, replace the
switch.
3. If there is no continuity when a 50 kPa (7 psi) pressure
is applied through the oil hole, the switch is operating
properly.
Check for air leaks. If air does leak, the diaphragm is
broken. Replace the switch.
Fine wire
EM -69
EDDA061A
EDDA061B