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Gian Businesses Index & Contractors in Levin and wellington NZ
 
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CAT 312 EXCAVATORS COOLING SYSTEM

& OVERHEATING PROBLEMS & SOLVING

 

 The correct hydraulic oil is SAE 10W (ISO 32) oil.

 

 

CAT 312 the best choice for the work of drains, swamps and lake clearing on the farm due to its long reach and greater track wheelbase esp with the CL and BL models. However the normal 312 are also good. some farmers prefer the early 90s models with no computer as this can be a headache when one has to have the system diagnosed.

 

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COOLING SYSTEM


Check hoses if soft  & replace. You need to take the bottom plate off held by 4 bolts for the bottom radiator hose. Steam clean the motor and radiator fans etc & remove all debris esp in front of fan. Also clean the fan blades etc.
Esp from May thru to August even later always check your engine bay before starting the machine. Birds esp starlings love to build nests on the motor & most fires are caused by nests apart from arson.  Starlings can build a nest in one day & they love building on top of the radiator so grass etc will be all over the radiator space & rest on the bottom plates.


1/. Check top and bottom hoses. Use a thermometer Lazer gun to test top hose radiator to the thermostat & then the bottom hose to the water pump. The thermo hose should read around 90 degrees and rhe bottom hose less as the coolant has gone from top to bottom of the radiator doing its job & comes out less in degrees. Lazer guns are cheap around $14 -18. Check the sensor also.

Temp Sensor off Aliexpress

Check 2 fan belts & if one is loose then you must replace both as stress on one will cause the other to break. If old looking or split also replace.


2/. Check if coolant & or water is in your engine oil. Coolant is red in colour. Remove dipstick & see if any water. If so then it’s a head gasket needs replacing.


3/. Under top hose to radiator & drain from top of tank. Have near level with top of radiator core then retighten the hose. Start the excavator & run with radiator cap for 30-45 minutes & check guage how many slots it fills on the guage. Normally small hole in thermostat will bring water to the top of radiator after heating up, Next put a load by working the machine & watch if the guage creeps up.


4/. If heating up then next check thermostat or [ regulator ] take off & put in a pot of boiling water & watch as the thermostat opens. If so then the thermostat is OK. Cost if not is $138.00 + GST.& a 3 bolt gasket they want $38 at Terracat NZ a ripoff so make your own. If you have time buy off Aliexpress. If Ok put back or replace if faulty & you can buy a themostst cheaper on Aliexpress comes with O ring. You need to buy a gasket & an O ring but its easy to make a gasket..


5/. If water pump is OK once you check the flow then fine otherwise must replace.

Best to change the thermostat as well & clean the fans of the radiator for dust, debris etc & flush the radiator.

6/. The radiator is a great place for starlings and birds to make nests and theres hardly any gap in between them to clean the radiatior & the big oil cooler in front. Best to take them both out and clean & or replace if need be. Radiators arent cheap & sometimes cheaper to buy imported from China .


6 Causes of a Cold Lower Radiator Hose

  1. Faulty thermostat
  2. Faulty Water pump
  3. Low Coolant Level
  4. Air in the coolant system
  5. Clogged Coolant System
  6. No problem at all

200 degrees F

93.3 degrees C & should be able to stand around 120 degrees C.

Top Radiator Hose: Part No 1189921   =  161.50 + GST
Bottom Radiator Hose : Part No 1355723  = $175.02 + GST
Regulator or Thermostat: Part No: 5i8010   = $138.98 + GST

 

The engine has the specs stamped on the engine cover .

Always quote the serial number when buying parts.

 

CHECK YOUR COOLANT:

cat 312 uses Extended Life Coolant (ELC) Extended Life Inhibitor (ELI™) Diesel Engine Antifreeze Coolant (DEAC™) Natural Gas Antifreeze Coolant (NGEC™)Red coolant typically has a base of Organic Acid Technology which is designed to be more suitable for aluminium radiators.

OVERHEATING PROBLEMS

OVERHEATING PROBLEMS TO CHECK

1/. Check the coolant and flushed first. Hydraulic and engine oil levels are proper. Check the fan shrouds be sure the fan is drawing air as intended.
correct thermostat is installed it's fully open at 92 deg C thermostat valve.

2/. Check the thermostat and temp sensor & test thermostat IR Gun in a boiling pot to see if it opens & closes.These are cheap to buy & use & you can check any hot water items eg.head etc... check the temperature difference between top tank and bottom tank.if the bottom tank is too cold when compared to top tank, check for the water pump drive belt, pully, radiater could be internally clogged, thermostat etc
If it attacks aluminium you need to be doubly careful. TBH I would check the hose temps first then think about what action to take. These machines are known for accumulating debris in between the radiator and the hydraulic oil cooler which significantly reduces air flow and leads to overheating. It might pay you to pull the complete cooling package out and thoroughly clean it before proceeding further.

3/. Start the engine and run normal then use e Lazer thermometer gun to check temp of top hose to thermostat around 90F & then the bottom hose to the water pump. The bottom should be less than the top as coolant runs thru to bottom then should come out cooler.

4/. Remember you are not loading the excavator with work which will increase the temp

5/. Pays to remove the radiator and the oil cooler radiator in front and clean both while out & or replace.


6/. If still overheating then change water pump

7/. Does the turbo have a waste gate? If so, is it functioning? Inside baffles of a muffler break and get dislodged causing high back pressure.


Before throwing any parts at it I would be pulling the cooling package, splitting the radiator from the cooler and thoroughly cleaning them both.

Once that's done and back in the machine, a replacement thermostat, new fan belt, a flush of the cooling system and some decent Extended Life Heavy Duty Coolant ought to get you back on the road

 

 

FUEL CONSUMPTION

Cat 320 for 7 hours average 6 gallons per hour consumption

Cat 311- 312 - 315 Excavator On full throttle uses about 4 gallons per hour depending on the work which is 30-35 gallons in 8 hours on the hour meter.

 

CL on a cat excavator? is a Model designator. The C is generally stands for the the 3rd generation of that particular model machine. The L usually designates that machine as having a longer (than normal) set of crawler tracks. An example would be Cat 320CL Excavator or the 312 BL

The 312B has a 3064 turbo diesel engine producing 84 flywheel HP (FWHP). It comes standard with a power and work mode selector including a new user mode, and very good operator seat and console with longer stick.

 

WHERE TO BUY PARTS IN NZ:

# Mufflers made Waitara: 06 8256351

# Doors & parts Lakeland:07 3470765   0274945886  info@heavy-machinery.co.nz

Lakeland Heavy Machinery 126-136 View Rd, P.O.Box 1976 Rotorua

# Excavator World Hokitika. : 483B Hau Hau Rd, Hokitika 7811 Tel: 03-756 8020

http://www.excavatorworld.co.nz/dismantling.html

# After Market Parts & used CAT or Komatsu Parts try Machinery Specialists in

Palmerston North as they import all the time : Rex on 063568459

# Porter Group in Hamilton wreck many excavators as well. Tel: 07-849 3956

www.portergroup.co.nz

OVERSEAS PARTS:

http://www.vankeppelusedparts.com/dismantled.htm

ARE WRECKING: 2004 Cat 330cl

 

Caterpillar 312BL excavator 

Technical specifications:

312B L

Production year model/type

1998-2002

Engine:

Caterpillar

Cil/Turbo/intercooler

3054T

Engine model: 

4TI

Rated output: (Kw/Hp/Rpm)

66 /90 /1900

Maximum torque: (Nm/Rpm)

x

Displacement: (cm³)

3990

Fuel: 

Diesel

Hydraulic system:

Capacity hydraulic tank: (Ltr)

98

Capacity hydraulic system: (Ltr)

162

Pump hydraulic flow capacity: (Ltr/min)

2 x 120

Auxilary flow capacity: (option) (Ltr/min)

x

Maximum working pressure: (bar)

299

 

The 311 with swamp tracks

Dimensions & weight: (Monoboom)

Arm 2100mm

2500mm

3000mm

Operating weight: (Kg)

13270

13340

13418

Length transport with monoboom: (mm)

7610

7610

7630

Height cab: (mm)

2900

Height transport with monoboom: (mm)

2650

2655

2655

Body width: (mm) 

2550

Track width standard: (mm)

500

Width over tracks: (tracks 500mm)

2490

Width over tracks: (tracks 600mm)

2590

Width dozer blade: (mm)

2490 (optional)

Track length on the ground: (mm)

3040

Gradebility: (%/°)

x

Ground pressure: (kg/cm²)

0,38

Fuel tank: (Ltr)

250

Operating information: (Monoboom)

Arm 2100mm

2500mm

3000mm

Max. reach at ground level: (mm)

7810

8190

8640

Max. loading height: (mm)

5830

6080

6310

Max. digging depth: (mm)

5150

5550

6050

Max. cutting height: (mm)

8270

8520

8750

Maximum travel speed:(Km/h low-high)

5.0


COBRA ATTACHMENTS is a new NZ company that sells & imports buckets and quick hitches. Check them out at www.cobraattach.co.nz or call 0800223553

 

We also have made in Thailand & China to your specs and can import CAT after market parts. We are having made rakes and grab rakes for these CAT 11 tonne and 12 tonne excavators.

When buying parts always quote your model and serial number as there are many variations. If you need parts etc for the 311 please ask us as we have a parts book and service manual for this model. A workshop manual can cost up to $650??? so not cheap.

If you need help check the costs for a diagnosis as not cheap:

 

 

We are preparing more pages to help farmers in NZ with maintenance & servicing etc.

CAT 311-312 [ CAB view & monitoring Spec pics ] [ CAT 311& 312 info views ]

 

We are also suppliers of NEW Komatsu spare parts for PCs up to 4 tonne as well looking for agents to buy our [ retread truck and bus tyres ]. RUBBER EXCAVATOR TRACKS FOR SALE all models : [ RUBBER TRACKS ] [ Kiwi bulldozer parts links ] [ Komatsu mini excavator parts ]. NZ hobby restoring [ Hitachi UH041 ] [ Excavator workshop Problems ]

 

 

 

 

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