Komatsu PC390LC-10 Shop Manual page 44

FOREWORD
PUSH PULL COUPLER
WARNING! Before performing the following work, release
the residual pressure from the hydraulic tank.
For details, see TESTING AND ADJUSTING,
Releasing residual pressure from hydraulic
tank.
WARNING! Even if the residual pressure is released from
the hydraulic tank, some hydraulic oil flows
out when the hose is disconnected.
Accordingly, prepare an oil receiving
container.
Type 1
Disconnection
1. Release the residual pressure from the hydraulic tank. For details,
see TESTING AND ADJUSTING, Releasing residual pressure
from hydraulic tank.
2. Hold the adapter (1) and push the hose joint (2) into the mating
adapter (3). The adapter can be pushed in about 3.5 mm. Do not
hold the rubber cap portion (4).
3. After the hose joint (2) is pushed into the adapter (3), press the
rubber cap portion (4) against the adapter until it clicks.
4. Hold the hose adapter (1) or hose (5) and pull it out. Since some
hydraulic oil flows out, prepare an oil receiving container.
Connection
1. Hold the hose adapter (1) or hose (5) and insert it in the mating
adapter (3), aligning them with each other. Do not hold the rubber
cap portion (4).
2. After inserting the hose in the mating adapter, pull it back to check
its connecting condition. When the hose is pulled back, the rubber
cap portion moves toward the hose about 3.5 mm. This does not
indicate an abnormality.
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PUSH PULL COUPLER
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PC360/390LC-10