Part of the John Deere Repair Manuals.
By this afternoon you could have the John Deere 27C ZTS, 35C ZTS technical manual PDF (TM2052) open beside the machine, running the operational checkout that fills the front of its 322 pages. Electrical coverage takes up a large block of the book, with system diagrams and sub-system diagnostics that let you follow a circuit from the key switch to the component that quit. Hydraulic theory, diagnostics, and pressure tests fill over a third of the pages, from the pilot control circuit through the travel motors. Set engine oil pressure against the 448 to 515 kPa (65 to 75 psi) window, and call a machine mistracking if it drifts more than 200 mm over a 20 m test line. Chasing a mistrack without the numbers eats a whole day. Bookmarked and text-searchable, the download puts you an hour from having the machine back on the meter.
What's Inside This John Deere 27C ZTS, 35C ZTS Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 5-21 | Foreword, Manual Scope, Safety Practices, Machine Guarding, Fluid Handling |
| Operational Checkout Procedure | 22-53 | Glow Plug Circuit Check, Monitor and Gauge Circuit Check, Pilot Control Shut-Off Switch Check, Propel Alarm Check, Cycle Times Check |
| Diagnostic Information | 54-81 | Diagnostic Approach, Fault Isolation, Reference Charts |
| System Information and Diagrams | 82-133 | System Descriptions, System Diagrams, Component Relationships |
| Sub-System Diagnostics and References | 134-181 | Sub-System Fault Isolation, Reference Tables |
| Theory of Operation | 182-249 | Cooling Fan and Water Pump, Hydraulic Theory, Electrical Theory |
| Diagnostics and Tests by Group | 250-322 | Group Diagnostics, Test Procedures, Measured Values |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Distance of Mistrack | less than 200 mm (7.87 in.) | p. 38 |
| Test Line (distance) | 20 m (66 ft.) | p. 38 |
| Delivery Valve Holder Torque | 39—44 N·m (29—33 lb-ft) | p. 68 |
| Engine Compression Pressure | 2910 kPa (29.1 bar) (422 psi) | p. 74 |
| Engine Oil Pressure | 448—515 kPa (4.48—5.15 bar) (65—75 psi) | p. 75 |
| Nut-to-Pilot Pressure Regulating Valve Housing Torque | 25 N·m (18 lb-ft) | p. 280 |
| Nut-to-Pilot Pressure Regulating Valve Housing Torque (27C ZTS) | 25 N·m (18 lb-ft) | p. 280 |
| Nut-to-Pilot Pressure Regulating Valve Housing Torque (35C ZTS) | 25 N·m (18 lb-ft) | p. 281 |
| Hydraulic Pump 1 and 2 Flow Rate (27C ZTS) at 13 790 kPa (2000 psi) | 27 L/min (7.3 gpm) | p. 295 |
| Hydraulic Pump 1 and 2 Flow Rate (27C ZTS) at 20 680 kPa (3000 psi) | 26 L/min (6.9 gpm) | p. 295 |
| Slow Idle Speed | 1200-1300 rpm | p. 65 |
| Fast Idle Speed | 2475-2575 rpm | p. 65 |
John Deere 27C ZTS, 35C ZTS Common Problems This Manual Covers
John Deere 27C ZTS hydraulics slow on all functions, boom and arm barely lift under load
Check hydraulic oil level and inspect the suction line for collapse first. Then flow test pumps 1 and 2 using the Hydraulic System tests starting on page 179. On a 27C ZTS, expect 27 L/min (7.3 gpm) at 13 790 kPa (2000 psi) per page 295; low flow means a worn pump.
Manual Section: Hydraulic System p. 179Travel stuck in slow speed mode, will not shift to fast when foot switch pressed
Работать по Operational Checkout Procedure: проверка Propel Alarm на странице 30 и замеры циклов на страницах 42 и 44 показывают, добирается ли машина до штатной скорости; расхождение с таблицей укажет, где искать дальше.
Manual Section: Operational checkout procedure p. 30Engine overheats within an hour of work, coolant temperature gauge climbs into the red
Сначала убедиться, что врёт не прибор: проверка Monitor and Gauge Circuit на странице 27. Если показания верные, разбор системы охлаждения — вентилятор, проставка и водяной насос — расписан в Theory of Operation на странице 49.
Manual Section: Operational checkout / theory of operation p. 27Engine cranks but will not start, or stalls and dies when digging under load
Replace the fuel filter and bleed the system before chasing anything expensive; a restricted filter starves the engine under load. Follow the engine diagnostic tests beginning on page 47. If you pull delivery valve holders during injection pump work, torque them to 39-44 N\u00b7m on reassembly, spec on page 68. Confirm slow idle sits at 1200-1300 rpm afterward, page 65.
Manual Section: Engine p. 47All hydraulic functions dead with engine running, control levers move but nothing responds
На экскаваторе это чаще всего отсечка пилотного контура, а не насос: проверка Pilot Control Shut-Off Switch на странице 29 стоит первой в списке.
Manual Section: Operational checkout procedure p. 29Frequently Asked Questions
What are the torque specifications for the delivery valve holder on the injection pump?
The delivery valve holder on the injection pump must be tightened to a torque of 39—44 N·m (29—33 lb-ft). p. 68
What is the specified fan belt deflection for the 27C ZTS and 35C ZTS?
The fan belt deflection should be 7—9 mm (0.28—0.35 in.) when measured at 98N (22 lb) of force. p. 69
What is the intake and exhaust valve lash clearance on the John Deere 27C ZTS, 35C ZTS excavator engine?
The intake and exhaust valve lash clearance for a cold engine is 0.15—0.25 mm (0.006—0.01 in). p. 70
What is the specified engine compression pressure for the John Deere 27C ZTS, 35C ZTS excavator?
The specified engine compression pressure is 2910 kPa (29.1 bar) (422 psi). p. 74
What is the normal engine oil pressure at fast idle on a John Deere 27C ZTS, 35C ZTS excavator?
The normal engine oil pressure at fast idle is 448—515 kPa (4.48—5.15 bar) (65—75 psi). p. 75
What exactly do I receive with this John Deere 27C ZTS Technical Manual?
All 322 pages arrive as one searchable PDF at checkout. Read it at the desk, then take the phone out to the machine.
Can I print a copy of this John Deere 27C ZTS Technical Manual for the shop?
Printing is allowed without restriction. Pull the pages you need for the job and bin them when they get greasy.
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