Oil Pump Service - Yamaha MM700A Manual

This chapter covers complete oil injection system ser-
vice.
All models are equipped with the Yamaha Autolube oil
injection system (Figure 1). The system consists of a me-
chanical gear-driven pump (Figure 2, typical), external
oil tank (Figure 3, typical), hoses, throttle/oil pump cable
assembly and a dash mounted low oil level warning light.
A junction box connects the throttle and pump cable so
they operate simultaneously. The oil pump, mounted on
the rear of the lower crankcase half, is driven by the cross
shaft connected to the crankshaft worm gear.
Oil injection systems can vary the amount of oil pro-
vided to the engine cylinders instantly and accurately for
optimum lubrication at any speed or engine load condi-
tion.
In contrast, engines without oil injection require that the
oil be mixed with the gasoline. The ratio of oil must be
sufficient for high-speed and load conditions.

OIL PUMP SERVICE

Oil Pump Bleeding
The oil lines must always be filled with oil. If the oil
tank ran dry, any oil injection hose was disconnected or
the machine was on its side; bleed air from the pump as
follows:
1. Remove the carburetors as described in Chapter Five.
Oil Injection System
2. Check that all hoses are connected to the pump and to
the oil reservoir tank.
ter replacing a hose, fill that hose with the
same oil used in the reservoir tank (see
Chapter Three for oil type). Reconnect the
hose after$lling.
3. Place a rag under the oil pump to catch oil draining
from the pump.
Fuel
pump
Carburetors
NOTE
NOTE