TK711, TK721, TK722 and TK732 Track Feller Bunchers Hydraulic System Operational Checks Caterpillar


Operational Checks
`
1.1. Pressure Specifications
2.2. Implement Control Valve
3.2. Travel Control Valve
4.2. Control Valve (Intermittent Saw)
5.2. Implement Pump and Travel Pump
6.2. Saw Pump
7.2. Pilot Pump

------ WARNING! ------

To prevent personal injury when checks are made while the machine is in operation, make sure only approved personnel are on the machine. Keep other personnel off the machine and in view of the operator. Make sure checks are done in an open area.

----------------------

The operation checks can be used to find leakage in the hydraulic system. Also, the operation checks can be used to find failed valves or a failed hydraulic pump.

Make sure that the machine is resting on a smooth, level surface. The machine should be moved away from other operating machines and away from personnel.




    Illustration 1g00827520

    Hydraulic lockout control on early machines




    Illustration 2g01162811

    Hydraulic lockout control on later machines

  1. Start the engine. Move the hydraulic lockout control to the UNLOCKED position.

  1. Increase the hydraulic oil temperature to 55 ± 5°C (130 ± 10°F).

  1. Extend the implement cylinders and retract the implement cylinders several times. Allow the implement cylinders to travel full stroke in each direction.

  1. Watch the cylinder as the cylinder is extended and retracted. The movement of the cylinder must be smooth and regular.

  1. Move the implements to the HOLD position.

  1. Observe the display monitor for any fault codes. If a fault code exists, fix the fault before you troubleshoot the hydraulic system.

  1. Shut off the engine.

Pressure Specifications

Implement Control Valve

Table 1
218-8379 Bank Valve (Seven)    
Function     Boom     Tilt     Stick     Swing     Grapple arms     Accumulator arms     Tool    
Line Relief Setting    
35700 ± 500 kPa (5180 ± 75 psi)
357 ± 5 bar    

27600 ± 500 kPa (4000 ± 75 psi)
276 ± 5 bar    

35700 ± 500 kPa (5180 ± 75 psi)
357 ± 5 bar    

28800 ± 500 kPa (4180 ± 75 psi) (1)
288 ± 5 bar    

23300 ± 500 kPa (3380 ± 75 psi)
233 ± 5 bar    

23300 ± 500 kPa (3380 ± 75 psi)
233 ± 5 bar    

35700 ± 500 kPa (5180 ± 75 psi)
357 ± 5 bar    
Line Relief Setting    
35700 ± 500 kPa (5180 ± 75 psi)
357 ± 5 bar    

27600 ± 500 kPa (4000 ± 75 psi)
276 ± 5 bar    

35700 ± 500 kPa (5180 ± 75 psi)
357 ± 5 bar    

28800 ± 500 kPa (4180 ± 75 psi) (1)
288 ± 5 bar    

23300 ± 500 kPa (3380 ± 75 psi)
233 ± 5 bar    

23300 ± 500 kPa (3380 ± 75 psi)
233 ± 5 bar    

35700 ± 500 kPa (5180 ± 75 psi)
357 ± 5 bar    
Flow Rate    
20 L/min (5 US gpm)    

55 L/min (15 US gpm)    

20 L/min (5 US gpm)    

190 L/min (50 US gpm)    

190 L/min (50 US gpm)    

190 L/min (50 US gpm)    

154 L/min (40 US gpm)    
Flow Rate    
160 L/min (42 US gpm)    

55 L/min (15 US gpm)    

160 L/min (42 US gpm)    

190 L/min (50 US gpm)    

190 L/min (50 US gpm)    

190 L/min (50 US gpm)    

210 L/min (54 US gpm)    
Signal Limiter Valve     -    
26000 kPa (3770 psi)    
-     -     -     -     -    
Signal Limiter Valve     -    
26000 kPa (3770 psi)    
-     -     -     -     -    
Signal Limiter Valve     -     -     -    
27500 kPa (4000 psi)    
-     -     -    
Signal Limiter Valve     -     -     -    
27500 kPa (4000 psi)    
-     -     -    
Signal Limiter Valve     -     -     -     -    
22000 kPa (3200 psi)    
-     -    
Signal Limiter Valve     -     -     -     -    
22000 kPa (3200 psi)    
-     -    
Signal Limiter Valve     -     -     -     -     -    
22000 kPa (3200 psi)    
-    
Signal Limiter Valve     -     -     -     -     -    
22000 kPa (3200 psi)    
-    
( 1 ) The relief valves are located on the swing motor.

Table 2
256-0500 Bank Valve (Seven (Harvester Head))    
Function     Boom     Stick     Rotator     Swing     Supply
Harvester Head    
Line Relief Setting    
35000 kPa (5080 psi)    

35000 kPa (5080 psi)    

23000 kPa (3335 psi)    

33800 kPa (4900 psi) (1)    
-     -    
Line Relief Setting    
35000 kPa (5080 psi)    

35000 kPa (5080 psi)    

23000 kPa (3335 psi)    

33800 kPa (4900 psi) (1)    
-     -    
Flow Rate    
20 L/min (5 US gpm)    

20 L/min (5 US gpm)    

105 L/min (28 US gpm)    

190 L/min (50 US gpm)    
0     0    
Flow Rate    
160 L/min (42 US gpm)    

160 L/min (42 US gpm)    

105 L/min (28 US gpm)    

190 L/min (50 US gpm)    

190 L/min (50 US gpm)    

190 L/min (50 US gpm)    
Signal Limiter Valve     -     -    
21000 kPa (3045 psi)    

32500 kPa (4700 psi)    
-     -    
Signal Limiter Valve     -     -    
21000 kPa (3045 psi)    

32500 kPa (4700 psi)    

27500 kPa (4000 psi)    

27500 kPa (4000 psi)    
( 1 ) The relief valves are located on the swing motor.

Table 3
218-8378 Bank Valve (Five (Harvester Head))    
Function     Boom     Extension     Stick     Swing     Rotator    
Line Relief Setting    
35700 ± 500 kPa (5180 ± 75 psi)
357 ± 5 bar    

31700 ± 500 kPa (4600 ± 75 psi)
317 ± 5 bar    

35700 ± 500 kPa (5180 ± 75 psi)
357 ± 5 bar    

28800 ± 500 kPa (4180 ± 75 psi) (1)
288 ± 5 bar    

22700 ± 500 kPa (3290 ± 75 psi)
227 ± 5 bar    
Line Relief Setting    
35700 ± 500 kPa (5180 ± 75 psi)
357 ± 5 bar    

31700 ± 500 kPa (4600 ± 75 psi)
317 ± 5 bar    

35700 ± 500 kPa (5180 ± 75 psi)
357 ± 5 bar    

28800 ± 500 kPa (4180 ± 75 psi) (1)
288 ± 5 bar    

22700 ± 500 kPa (3290 ± 75 psi)
227 ± 5 bar    
Flow Rate    
20 L/min (5 US gpm)    

145 L/min (38 US gpm)    

20 L/min (5 US gpm)    

190 L/min (50 US gpm)    

105 L/min (28 US gpm)    
Flow Rate    
160 L/min (42 US gpm)    

115 L/min (30 US gpm)    

160 L/min (42 US gpm)    

190 L/min (50 US gpm)    

105 L/min (28 US gpm)    
Signal Limiter Valve     -     -     -     -     -    
Signal Limiter Valve     -     -     -     -     -    
Signal Limiter Valve     -     -     -    
27500 kPa (4000 psi)    
-    
Signal Limiter Valve     -     -     -    
27500 kPa (4000 psi)    
-    
Signal Limiter Valve     -     -     -     -    
21000 kPa (3045 psi)    
Signal Limiter Valve     -     -     -     -    
21000 kPa (3045 psi)    
( 1 ) The relief valves are located on the swing motor.

Table 4
Control Valves    
Function     Implement     Travel     Intermittent Saw (if equipped)    
Main Relief Valve (Load Sensing)    
35800 ± 300 kPa (5200 ± 45 psi) (Felling Head)

28000 ± 300 kPa (4060 ± 45 psi) (Harvester Head)    

35800 ± 300 kPa (5200 ± 45 psi)    
The relief valve is not used. Turn the screw on the relief valve until the screw bottoms out.    

Travel Control Valve

Table 5
218-8377 Control Valve    
Function     Left Travel     Side Leveling     Forward Leveling     Right Travel    
Flow Rate (A)    
175 L/min (46 US gpm)    

105 L/min (28 US gpm)    

105 L/min (28 US gpm)    

175 L/min (46 US gpm)    
Flow Rate (B)    
175 L/min (46 US gpm)    

105 L/min (28 US gpm)    

105 L/min (28 US gpm)    

175 L/min (46 US gpm)    
Signal Limiter Valve (C)     -    
22235 kPa (3225 psi)    
-     -    
Signal Limiter Valve (D)     -    
22235 kPa (3225 psi)    
-     -    
Signal Limiter Valve (E)     -     -    
22235 kPa (3225 psi)    
-    
Signal Limiter Valve (F)     -     -    
22235 kPa (3225 psi)    
-    

Control Valve (Intermittent Saw)

Table 6
242-4238 Control Valve    
Function     Saw     Saw    
Flow Rate (A)    
240 L/min (63 US gpm)    

240 L/min (63 US gpm)    
Flow Rate (B)    
240 L/min (63 US gpm)    

240 L/min (63 US gpm)    
Signal Limiter Valve     -     -    
Signal Limiter Valve     -     -    

Implement Pump and Travel Pump

Table 7
Standby Pressure    
2200 kPa (320 psi)    
Margin Pressure    
2200 kPa (320 psi)    

Saw Pump

Table 8
Pump Compensator Pressure (Cutoff)    
31000 kPa (4500 psi)    
Load Sensing Control Pressure    
2000 kPa (290 psi)    

Pilot Pump

Table 9
Pump Delivery Pressure    
4120 ± 200 kPa (600 ± 30 psi)    
Relief Valve Pressure    
4120 ± 200 kPa (600 ± 30 psi)    

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