Service
3 - 4
Pilot Supply Pressure Check
All except installation on SD32DQ (U64)
Test Equipment:
•
(1) 1,000 psi (6,895 kPa) Gauge
Connect pressure gauge to test port:
•
Dozer pilot test port
General
Adequate standby pilot supply is required for both dozer
and winch functions.
NOTICE
The values in Table 3-2 are based on
information available at time of publishing.
Refer to the service/maintenance manual
supplied with your dozer to verify the
available pilot pressure.
Instructions
1. Shut engine off but turn dozer key switch back on to
provide electrical power to the winch.
2. Move dozer work equipment lever to unlock position
to enable winch.
3. Move control switch from
BRAKE-ON
to
BRAKE-OFF
several times to de-energize the hydraulic system.
4. Move dozer work equipment lever to locked position.
5. Connect a 1000 psi gauge to the dozer pilot test port
(see dozer Service Manual).
6. Start dozer and set to high-free idle.
7. Check that the pressure reading is within the range
shown for your dozer in Table 3-2.
If the pressure is not as specifi ed, check for:
1. Improper pilot supply valve setting or malfunction (See
dozer Service Manual).
2. Pump pressure setting incorrect (See dozer Service
Manual).
3. Leaking pressure hoses or fi ttings.
4. Correct pilot supply location from dozer.
1000 PSI Gauge
at Dozer Pilot
Test Port
See dozer service manual for
pilot test port location.
Figure 3-4 Test Equipment Setup
Table 3-2 Hydraulic Pressure Readings
Dozer
Pilot Pressure in
PSI [kPa]
Dozer Pilot Test Port
Komatsu
D155AX-6/-7 (K64)
575 - 647
[3,964 - 4,461]
Komatsu
D275AX-5 (K65)
500 - 570
[3,447 - 3,930]
Komatsu
D85-15 (K50)
534 - 618
[3,682 - 4,261]
Liebherr
PR754 (L54)
290 - 350
[1,999 - 2,413]
Liebherr
PR756 (L56)
290 - 350
[1,999 - 2,413]
Liebherr
RL56 (L561)
335 - 365
[2,310 - 2,517]
CAT
D8R Series II (C59)
400 - 450
[2,758 - 3,103]
CAT
D8T Tier 4 (C74)
400 - 450
[2,758 - 3,103]
John Deere
JD1050K (E75)
620 - 650
[4,275 - 4,482]
Summary of Contents for H12E
Page 8: ...vi Notes ...
Page 48: ...General 1 40 Notes ...
Page 54: ...Section 1 1 46 Figure 1 35 H12E Hydraulic Electrical Schematic Option Code B CAT D8T C74 ...
Page 55: ...Section 1 1 47 Figure 1 36 H12E Hydraulic Electrical Schematic Option Code D CAT D8T C74 ...
Page 59: ...Section 1 1 51 Figure 1 40 H12E Hydraulic Electrical Schematic Option Code D CAT D8R C59 ...
Page 63: ...Troubleshooting 2 4 Notes ...
Page 75: ...Service 3 12 Notes ...
Page 90: ...Section 4 4 15 Intentionally Blank ...
Page 102: ...Section 4 4 27 Intentionally Blank ...
Page 108: ...Section 4 4 33 Intentionally Blank ...
Page 116: ...Section 4 4 41 Intentionally Blank ...
Page 119: ...Repairs 4 44 Notes ...
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