Each installation application can be different. The
differences depend on the following factors:
• Type of hose
• Type of fitting material
• Anticipated expansion and contraction of the hose
• Anticipated expansion and contraction of the
fittings
Due to extreme temperature changes, the hose will
heat set. Heat setting causes hose clamps to loosen
which can result in leaks. A constant torque hose
clamp will help to prevent loose hose clamps.
Replace hoses that are cracked or soft. Replace
hoses that show signs of leakage. Replace hoses
that show signs of damage. Replace hose clamps
that are cracked or damaged. Tighten or replace
hose clamps which are loose.
Replace the Hoses and the Clamps
NOTICE
Care must be taken to ensure that fluids are con-
tained during performance of inspection, mainte-
nance, testing, adjusting, and repair of the product.
Be prepared to collect the fluid with suitable contain-
ers before opening any compartment or disassem-
bling any component containing fluids.
Refer to Special Publication, NENG2500, “Cat Dealer
Service Tool Catalog” or refer to Special Publication,
PECJ0003, “Cat Shop Supplies and Tools Catalog”
for tools and supplies suitable to collect and contain
fluids on Cat products.
Dispose of all fluids according to local regulations
and mandates.
Cooling System
Pressurized System: Hot coolant can cause seri-
ous burns. To open the cooling system filler cap,
stop the engine and wait until the cooling system
components are cool. Loosen the cooling system
pressure cap slowly in order to relieve the
pressure.
Personal injury can result from removing hoses
or fittings in a pressure system.
Failure to relieve pressure can cause personal
injury.
Do not disconnect or remove hoses or fittings un-
til all pressure in the system has been relieved.
1. Stop the engine.
2. Allow the engine to cool.
3. Before servicing a coolant hose, slowly loosen the
filler cap for the cooling system in order to relieve
any pressure.
4. Remove the filler cap for the cooling system.
5. Drain the coolant from the cooling system to a
level that is below the hose that is being replaced.
Drain the coolant into a suitable clean container.
The coolant can be reused.
6. Remove the hose clamps.
7. Disconnect the old hose.
8. Replace the old hose with a new hose.
9. Install hose clamps which have been inspected or
install new hose clamps. Refer to Specifications,
SENR3130, “Torque Specifications” “Hose
Clamps” for information about selecting and
installing the proper hose clamps.
10. Refill the cooling system.
11. Clean the coolant filler cap. Inspect the gaskets
on the filler cap. Inspect the gasket seat. Inspect
the vacuum valve and seat for debris or damage.
Replace the filler cap if the gaskets are damaged.
Install the filler cap.
12. Start the engine. Inspect the cooling system for
leaks.
Fuel System
Personal injury can result from removing hoses
or fittings in a pressure system.
Failure to relieve pressure can cause personal
injury.
Do not disconnect or remove hoses or fittings un-
til all pressure in the system has been relieved.
SEBU7125-13
139
Maintenance Section
Hoses and Clamps - Inspect/Replace
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